In Professor Plum's biology class there are 40 students. Of those students, 80 percent have puppies. Of those who have puppies, 25% also have parrots. How many students have both puppies and parrots?

How many students have puppies? ** We start with the initial numbers of students, 40 and multiply that by .8 for 40 * 0.8 =

<<40*0.8=32>>32 who own puppies. How many students have both puppies and parrots? ** That the number of students with puppies, 32, and multiply that by .25 to find out how many own both puppies and parrots, 32 * 0.25 = <<32*0.25=8>>8 who own puppies and parrots. How many students have both puppies and parrots? ** The answer is <<8=8>>8. #### 8 An airplane took a trip along the Eastern Coast of the USA. During the trip, the plane hovered in Mountain time for 3 hours, Central time for 4 hrs, and Eastern time for 2 hrs. The next day it took 2 more hours to hover in each of the places it passed through the previous day. Calculate the total time it took the plane to hover over Mountain time, Central time, and Eastern time in the two days. How many hours did the plane hover over Mountain and Central time? ** The total time it took to hover over the Mountain and the central time is 3+4 = <<3+4=7>>7 hours. How many hours did the plane hover over Mountain, Central, and Eastern time? ** If it hovered further to the Eastern time zone, it took a total of 7+2 = <<7+2=9>>9 hours to cover the whole trip. How many hours did the plane hover over Mountain, Central, and Eastern time the next day? ** The next day, it took 2 more hours to cover each of the places it passed through the previous day, taking a total of 2*3 = <<2*3=6>>6 hours. How many hours did the plane hover over Mountain, Central, and Eastern time the second day? ** The total time it took on the second day to cover the distance it covered the previous day is 9+6 = <<9+6=15>>15 hours. How many hours did the plane hover over Mountain, Central, and Eastern time in the two days? ** In total, the train took 15+9 = <<15+9=24>>24 hours to hover over the places in the two days. #### 24 Sarah decided to pull weeds from her garden. On Tuesday she pulled 25 weeds. The next day she pulled three times the number of weeds she did the day before. On Thursday her allergies bothered her and she could only pull up one-fifth of the weeds she pulled on the day before. Finally, on Friday it rained for half the day and she managed to pull up 10 fewer weeds than she did on Thursday. In total, how many weeds did she pull up? How many weeds did Sarah pull on Wednesday? ** On Wednesday she pulled 25*3=<<25*3=75>>75 weeds How many weeds did Sarah pull on Thursday? ** On Thursday she pulled 75/5=<<75/5=15>>15 weeds How many weeds did Sarah pull on Friday? ** On Friday she pulled 15-10=<<15-10=5>>5 weeds How many weeds did Sarah pull up? ** In total she pulled 25+75+15+5=<<25+75+15+5=120>>120 weeds #### 120 Martin spends 2 hours waiting in traffic, then four times that long trying to get off the freeway. How much time does he waste total? How many hours does Martin spend trying to get off the freeway? ** First find the total amount of time he spends trying to get off the freeway: 2 hours * 4 = <<2*4=8>>8 hours How much time does Martin spend total? ** Then add the time he spends waiting in traffic to find the total time: 8 hours + 2 hours = <<8+2=10>>10 hours #### 10 Each wall of a 3 sided shower has 8 tiles running the width of the wall and 20 tiles running the height of the wall. How many tiles are in the shower? How many tiles are in the shower? ** There are 8 tiles along the width and 20 tiles along the height for a total of 8*20 = <<8*20=160>>160 tiles How many tiles are in the shower? ** Each wall has 160 tiles and there are 3 walls so there are 160*3 = <<160*3=480>>480 tiles in the shower #### 480 Reina has three times the number of counters and four times the number of marbles as Kevin. If Kevin has 40 counters and 50 marbles, calculate the number of counters and marbles that Reina has? How many counters does Reina have? ** If Kevin has 40 counters, and Reina has three, the number of counters Kevin has, Reina has 3*40 = <<40*3=120>>120 counters. How many marbles does Reina have? ** Reina also has four times the number of marbles that Kevin has, meaning he has 4*50 = <<4*50=200>>200 marbles. How many items does Reina have? ** In total, Reina has 120 counters + 200 marbles = <<120+200=320>>320 items. #### 320 Terry spent 6$ for breakfast on Monday, twice as much on Tuesday, and on Wednesday Terry spent double what he did the previous two days combined. How much did Terry spend total? How much did Terry spend on Monday? ** Monday: <<6=6>>6$ How much did Terry spend on Tuesday? ** Tuesday:6(2)=12$ How much did Terry spend on Wednesday? ** Wednesday:2(6+12)=36$ How much did Terry spend total? ** Total:6+12+36=<<6+12+36=54>>54$ #### 54 Julio receives a $1 commission for every customer that buys in Edgars Fashion Store. The store sells to 35 customers in the first week, twice as many in the second week, and triple as many as the first week in the third week. If he receives a salary of $500 for the 3 weeks and a bonus of $50, how much in total does he earn for the 3 weeks? How many customers buy in the second week? ** The number of customers who buy in the second week is 35 customers * 2 = <<35*2=70>>70 customers. How many customers buy in the third week? ** The number of customers who buy in the third week is 35 customers * 3 = <<35*3=105>>105 customers. How many customers buy in the 3 weeks? ** The total number of customers who buy during the 3 weeks is 35 customers + 70 customers + 105 customers = <<35+70+105=210>>210 customers. How much in total does he receive in commissions? ** The total commission he receives is 210 customers * $1/customer = $<<210*1=210>>210 How much in total does he earn? ** The total income he earns is $210 + $500 + $50 = $<<210+500+50=760>>760 #### 760 Randy has 1 more baseball glove than 7 times the number of bats he has. If he has 29 baseball gloves, how many bats does he have? What is 7 times the number of bats Randy has? ** 7 times the number of bats Randy has is 29-1=28. How many bats does Randy have? ** Randy has 28/7=<<28/7=4>>4 bats. #### 4 Anna's mom gave her $10.00 to buy anything she wanted from the candy store. Anna bought 3 packs of chewing gum for $1.00 each, 5 chocolate bars at $1 each and 2 large candy canes for $0.50 each. How much money did Anna have left? How much did Anna spend on chewing gum? ** Anna bought 3 packs of chewing gum that were $1 each for a total of 3*1=$<<3*1=3>>3 How much did Anna spend on chocolate bars? ** Anna bought 5 chocolate bars that were $1 each for a total of 5*1=$<<5*1=5>>5 How much did Anna spend on candy canes? ** Anna bought 2 large candy canes that were $.50 each for a total of 2*.50 =$<<2*.50=1>>1 How much money did Anna spend? ** The total amount spent was $3+$5+$1 = $<<3+5+1=9.00>>9.00 How much money did Anna have left? ** Anna had $10 to start and spent $9.00 so she had $10-$9.00 = $<<10-9=1.00>>1.00 left #### 1