Jillian had 80 oranges which she had bought to give to her friends. She divided each orange into ten equal pieces for each friend to get four pieces. How many friends were there?

If she divided each orange into 10 pieces, she got 80*10 =

<<80*10=800>>800 pieces of orange. Since each friend received 4 pieces, there were 800/4 = <<800/4=200>>200 friends. #### 200 Kenneth has $50 to go to the store. Kenneth bought 2 baguettes and 2 bottles of water. Each baguette cost $2 and each bottle of water cost $1. How much money does Kenneth have left? The cost of the baguettes is 2 × $2 = $<<2*2=4>>4. The cost of the water is 2 × $1 = $<<2*1=2>>2. The total cost of the shopping is $4 + $2 = $<<4+2=6>>6. Kenneth has $50 − $6 = $44 left. #### 44 Markus is twice the age of his son, and Markus's son is twice the age of Markus's grandson. If the sum of the ages of Markus, his son, and his grandson is 140 years, then how many years old is Markus's grandson? Let "x" be the age of Markus's grandson. If Markus's son is twice the age of Markus's grandson, then Markus's son is 2*x. If Markus is twice the age of his son, then Markus is 2*2*x. Therefore, if the sum of the ages of Markus, his son, and his grandson is 140 years, then x+(2*x)+(2*2*x)=140 years. Simplifying the equation, we see that 7*x=140 years. Therefore, the age of Markus's grandson is x=20 years old. #### 20 Cindy was hired to teach 4 math courses which required her to be in the classroom for 48 hours a week altogether. How much did Cindy earn for teaching 1 math course in a month with exactly 4 weeks if her hourly rate per class is $25? In a week, Cindy spends an average of 48 hours/week / 4 courses = 12 hours/week for 1 math course. In a month, 1 math course is 12 hours/week x 4 weeks/month = <<12*4=48>>48 hours. Therefore, she earns $25/hour x 48 hours/week = $<<25*48=1200>>1200 a month for 1 math course. #### 1,200 Belinda’s dog is missing, so she made 200 flyers to distribute around town with the help of her friends. Ryan passed out 42 flyers, Alyssa passed out 67, Scott passed out 51 and Belinda passed out the rest. What percentage of the flyers did Belinda pass out? The total number of flyers Belinda’s friends passed out was 42 by Ryan + 67 by Alyssa + 51 by Scott = <<42+67+51=160>>160 flyers. Belinda passed out 200 total flyers – 160 flyers passed out by friends = <<200-160=40>>40 flyers. To express this as a decimal, divide Belinda’s 40 flyers / 200 total flyers = <<40/200=0.20>>0.20. Belinda passed out 0.20 x 100% = 20% of the flyers. #### 20 Rookie police officers have to buy duty shoes at the full price of $85, but officers who have served at least a year get a 20% discount. Officers who have served at least three years get an additional 25% off the discounted price. How much does an officer who has served at least three years have to pay for shoes? Cops that served a year pay $85 * 0.2 = $<<85*0.2=17>>17 less. Cops that served a year pay $85 - $17 = $<<85-17=68>>68. Cops that served at least 3 years get a $68 * 0.25 = $<<68*0.25=17>>17 discount. Cops that served at least 3 years pay $68 - $17 = $<<68-17=51>>51 for shoes. #### 51 Keanu was surfing towards the shore at a speed of 20 miles per hour. A shark was swimming alongside him, riding the same wave, when it doubled its speed and moved away from Keanu. There was a pilot fish swimming alongside Keanu and the shark, and when the shark increased its speed, the pilot fish also increased its speed and moved away from Keanu, but only increasing its speed by half as much as the shark had increased its speed by. What speed, in miles per hour, was the pilot fish swimming when it moved away from Keanu? The shark went from 20 miles per hour to a speed of 2*20=40 miles per hour. The shark increased its speed by 40-20=<<40-20=20>>20 miles per hour. Half of the shark's increase in speed is 20/2=<<20/2=10>>10 miles per hour. Thus the pilot fish had increased its speed to 20+10=<<20+10=30>>30 miles per hour. #### 30 In order to train for his fights Rocky would run 4 miles on day one of training. Rocky would double the miles for day 2, and triple the miles from day 2 for day 3. How many miles did Rocky run in the first three days of training? Day 1:4 Day 2:2(4)=8 Day 3:8(3)=24 Total:4+8+24=<<4+8+24=36>>36 miles #### 36 John has 3 bedroom doors and two outside doors to replace. The outside doors cost $20 each to replace and the bedroom doors are half that cost. How much does he pay in total? The outside doors cost 2*$20=$<<2*20=40>>40 Each indoor door cost $20/2=$<<20/2=10>>10 So all the indoor doors cost $10*3=$<<10*3=30>>30 That means the total cost is $40+$30=$<<40+30=70>>70 #### 70 Bob picked 450 apples for his entire family to eat. There are 33 children in his family, and each of them ate 10 apples. If every adult ate 3 apples apiece, how many adults are in his family? The 33 children ate a total of 33 * 10 = <<33*10=330>>330 apples. There were 450 - 330 = <<450-330=120>>120 apples left for the adults to eat. If every adult ate 3 of the 120 apples left, then there were 120 / 3 = <<120/3=40>>40 adults in the family. #### 40