Ten percent less than twice the total number of students present in the science class yesterday have attended class today. If there were 70 students in the class yesterday and 30 students are absent today, calculate the number of students registered for the course.

Twice the number of students present in the science class yesterday is 70*2 =

<<70*2=140>>140 Ten percent less than twice the number of students present in the class yesterday means there are 10/100*140 = <<10/100*140=14>>14 fewer students than twice the number present yesterday. The number of students present in the science class today is 140-14 = <<140-14=126>>126 If the total number of registered students for the course who are absent today is 30, a full class of the science course has 126+30 = 156 students. #### 156 There is a fruit display that has apples, oranges, and bananas. There are twice as many apples as oranges, and there are twice as many oranges as bananas. How many fruits are on the display in total if there are 5 bananas on the display? We start by finding out that since there are twice as many oranges as the 5 bananas, this means there are 5*2=<<5*2=10>>10 oranges. Since there are twice as many apples as the 10 oranges, this means there 10*2=<<10*2=20>>20 apples. In total, this means there are 20+10+5= <<20+10+5=35>>35 fruits on the display. #### 35 Sean needs to replace 2 light bulbs in his bedroom, 1 in both the bathroom and the kitchen and 4 in the basement. He also needs to replace 1/2 of that amount in the garage. The bulbs come 2 per pack. How many packs will he need? He needs to replace lights in the bedroom, bathroom, kitchen and basement so 2+1+1+4 = <<2+1+1+4=8>>8 lightbulbs In the garage, he needs to replace half that amount so he needs 8/2 = <<8/2=4>>4 lightbulbs All total, he needs 8+4 = <<8+4=12>>12 light bulbs They come 2 per pack and he needs 12 lightbulbs so he needs 12/2 = <<12/2=6>>6 packs of lightbulbs #### 6 Bob enters cycling competitions every single week and hopes to win the 100 dollar grand prize each time. For the first 2 weeks, he managed first place and got 100 dollars each week. He is saving up for a puppy that costs 1000 dollars. What is the minimum number of additional weeks Bob must win first place? Two weeks already passed and Bob has 200 dollars. Bob needs 1000-200=<<1000-200=800>>800 more dollars. Bob needs to win the competition for at least 800/100=<<800/100=8>>8 more weeks. #### 8 Carla needs to dry-clean 80 pieces of laundry by noon. If she starts work at 8 AM, how many pieces of laundry does she need to clean per hour? First find how many hours Carla has to work: 12:00 - 8:00 = 4 hours Then divide the total amount of laundry by the number of hours to find how many pieces Carla has to clean per hour: 80 pieces / 4 hours = <<80/4=20>>20 pieces/hour #### 20 A watermelon weighs 23 pounds. If Farmer Kent sells his special watermelons for $2 a pound, how much money would he make for selling 18 watermelons of the same weight? A single watermelon would sell for $2 x 23 = $<<2*23=46>>46 60 watermelons would sell for $46 x 18 = $<<46*18=828>>828 #### 828 Cloud 9 Diving Company has taken individual bookings worth $12,000 and group bookings worth $16,000. Some people have cancelled at the last minute. $1600 has had to be returned to them. How much money has the sky diving company taken altogether? Cloud 9 earned $12,000 + $16,000 = $<<12000+16000=28000>>28,000 from bookings. After returning money due to cancellations, they had a final total of $28,000 - $1600 = $<<28000-1600=26400>>26,400. #### 26400 For this month, Lily wants to finish reading twice as many books as she finished last month. If she finished reading 4 books last month, what will be the total number of books that she will finish for two months? This month, Lily wants to finish reading 4 x 2 = <<4*2=8>>8 books. So, for two months, she will finish reading 4 + 8 = <<4+8=12>>12 books. #### 12 Mell went to a cafeteria to spend some time with her friends. She ordered two cups of coffee and one piece of cake. Two of her friends ordered the same, but each of them also bought a bowl of ice cream. One cup of coffee is $4, one piece of cake is $7, and a bowl of ice cream is $3. How much money did Mell and her friends need to pay at the cafeteria? Mell's friends bought two bowls of ice cream, so that was a cost of 2 * 3 = $<<2*3=6>>6. They all three bought two cups of coffee each, so they ordered 2 * 3 = <<2*3=6>>6 cups of coffee in total. The cost of the coffee was therefore 6 * 4 = $<<6*4=24>>24. All her friends bought one piece of cake each, so the cost of it in total was 3 * 7 = $<<3*7=21>>21. Mell and her friends spent in total 6 + 24 + 21 = $<<6+24+21=51>>51 at the cafeteria. #### 51 Tammy has 10 orange trees from which she can pick 12 oranges each day. Tammy sells 6-packs of oranges for $2. How much money will Tammy have earned after 3 weeks if she sells all her oranges? Tammy picks 10 trees x 12 oranges/tree = <<10*12=120>>120 oranges per day. Tammy sells 120 oranges/day / 6 oranges/pack = <<120/6=20>>20 6-packs of oranges a day Tammy sells 20 packs/day x 7 days/week = <<20*7=140>>140 6-packs a week In 3 weeks Tammy sells 140 packs/week x 3 weeks = <<140*3=420>>420 6 -packs Tammy makes 420 packs x $2/pack = $<<420*2=840>>840 #### 840