Jack bought 3 books a month at $20 each. He sells them back at the end of the year for $500. How much money did he lose?

He bought 3*20=$

<<3*20=60>>60 of books a month That means he bought 60*12=$<<60*12=720>>720 of books a year So he lost 720-500=$<<720-500=220>>220 #### 220 A clothing store sells 20 shirts and 10 pairs of jeans. A shirt costs $10 each and a pair of jeans costs twice as much. How much will the clothing store earn if all shirts and jeans are sold? Twenty shirts amount to $10 x 20 = $<<10*20=200>>200. The cost of each pair of jeans is $10 x 2 = $<<10*2=20>>20. So 10 pairs of jeans amount to $20 x 10 = $<<20*10=200>>200. Therefore, the store will earn $200 + $200 = $<<200+200=400>>400 if all shirts and jeans are sold. #### 400 If a tarantula has eight legs, and one tarantula egg sac can contain 1000 tarantulas, how many baby tarantula legs would be in one less than 5 egg sacs? One less than 5 is 5-1=<<5-1=4>>4. If one tarantula egg sac can contain 1000 tarantulas, then four egg sacs can hold 4*1000=4000 tarantula babies. If each tarantula baby has eight legs, the 4 egg sacs can contain 4000*8=<<4000*8=32000>>32,000 baby tarantula legs. #### 32000 Henry, John and Leo collected some seashells from the beach. Henry collected 11, Paul 24. If they initially collected 59 seashells in total and Leo gave a quarter of his collection to a younger kid they met, how many do they have in total now? Henry and Paul collected a total of 11+24 = <<11+24=35>>35 seashells To make a total of 59, Leo must have collected 59-35 = <<59-35=24>>24 seashells He gave out a quarter of 24 seashells which is 24*(1/4) = <<24*(1/4)=6>>6 seashells They are now left with 59-6 = <<59-6=53>>53 seashells #### 53 Chang's Garden has two kinds of apples. Sweet ones and sour ones. He can sell the sweet ones for $.5 an apple. The sour ones sell for $.1 an apple. 75% of the apples he gets are sweet and the rest are sour. If he earns $40, how many apples did his trees give him? 25% of the apples are sour because 100 - 75 = <<100-75=25>>25 The average price of an apple sold is $.4 because .75(.5) + .25(.1)= .4 He got 100 apples because 40 / .4 = <<40/.4=100>>100 #### 100 Marcos has to get across a 5 mile lake in his speedboat in 10 minutes so he can make it to work on time. How fast does he need to go in miles per hour to make it? 10 minutes for 5 miles means 10 minutes / 5 miles = <<10/5=2>>2 minutes/mile 1 hour is 60 minutes so 60 minutes/hour / 2 minutes/mile = 30 miles/hour #### 30 At the Delicious Delhi restaurant, Hilary bought three samosas at $2 each and four orders of pakoras, at $3 each, and a mango lassi, for $2. She left a 25% tip. How much did the meal cost Hilary, with tax, in dollars? The samosas cost 3*2=<<3*2=6>>6 dollars each. The pakoras cost 4*3=<<4*3=12>>12 dollars each. The food came to 6+12+2=<<6+12+2=20>>20 dollars The tip was an additional 20*.25=<<20*.25=5>>5 dollars The total is 20+5=<<20+5=25>>25. #### 25 Michael has 4 packs of crayons and wants to buy 2 more. One pack of crayons costs $2.5. How much are all the packs of crayons Michael will have after the purchase worth? After buying 2 more packs, Michael is going to have 4 packs + 2 packs = <<4+2=6>>6 packs of crayons. In total all packs are going to be worth 6 packs * $2.5/pack = $<<6*2.5=15>>15. #### 15 Tom Sawyer has tricked his friends into whitewashing Aunt Polly's 100-foot fence. His first friend, Ben, whitewashed 10 feet. His second friend Billy whitewashed a fifth of the remaining fence. A third friend, Johnny, whitewashed a third of the fence that was left after that. How much of the fence still needs to be whitewashed? It's a 100-foot fence, and Ben whitewashed 10 feet, so there are 100 - 10 = <<100-10=90>>90 feet left after Ben is done. Billy whitewashed a fifth of that, or 90 / 5 = <<90/5=18>>18 feet. There is now 90 - 18 = <<90-18=72>>72 feet of fence left. Johnny whitewashes a third of that, or 72 / 3 = <<72/3=24>>24 feet. That leaves 72 - 24 = <<72-24=48>>48 feet of fence left to be whitewashed. #### 48 A vampire needs to suck 7 gallons of blood per week to survive. If he sucks 2 pints of blood per person, how many people does he need to suck each day to survive? Each day it needs to consume 7/7=<<7/7=1>>1 gallon of blood There are 128/16=<<128/16=8>>8 pints per gallon So he needs to suck blood from 8/2=<<8/2=4>>4 people per day #### 4