A school choir needs robes for each of its 30 singers. Currently, the school has only 12 robes so they decided to buy the rest. If each robe costs $2, how much will the school spend?

The school needs to buy 30 - 12 =

<<30-12=18>>18 robes. So the school will spend 18 x $2 = $<<18*2=36>>36. #### 36 Mr. Wong harvested 560 mangoes from the tree outside his house. He sold half of it at the market and distributed the rest evenly among 8 of his neighbors. How many mangoes does each neighbor receive? Mr. Wong had 560/2 = <<560/2=280>>280 mangoes left Each of his neighbors received 280/8 = <<280/8=35>>35 mangoes #### 35 Jenna is hemming her prom dress. The dress's hem is 3 feet long. Each stitch Jenna makes is 1/4 inch long. If Jenna makes 24 stitches per minute, how many minutes does it take Jenna to hem her dress? First find how many inches the hem is by multiplying the length in feet by the number of inches per foot: 3 feet * 12 inches/foot = <<3*12=36>>36 inches Then divide the length in inches by the length of each stitch to find how many stitches Jenna makes: 36 inches / .25 inches = <<36/.25=144>>144 stitches Then divide the number of stitches by Jenna's stitching rate to find how long it takes her: 144 stitches / 24 stitches/minute = <<144/24=6>>6 minutes #### 6 Josie received $50 as a gift. She plans to buy two cassette tapes that cost $9 each and a headphone set that costs $25. How much money will she have left? The cassette tapes will cost 2 × 9 = $<<2*9=18>>18. She spends 18 + 25 = $<<18+25=43>>43 in total. Josie will have 50 - 43 = $<<50-43=7>>7 left. #### 7 There are 3 rows of people relaxing at the beach. The first row is made up of 24 people until 3 people get up to wade in the water. 5 people from the second row, which originally held 20 people, go to join them. The third row is made up of 18 people. How many people are left relaxing on the beach? In the first row, there are now 24 – 3 = <<24-3=21>>21 people. In the second row, there are now 20 – 5 = <<20-5=15>>15 people. So in total there are 21 in the first row + 15 in the second row + 18 in the third row = <<21+15+18=54>>54 people. #### 54 Carly practices her butterfly stroke for 3 hours a day, 4 days a week, and her backstroke for 2 hours a day, six days a week. How much time does she spend practicing swimming in a month with 4 weeks? First find the total time Carly practices the butterfly stroke in a week: 3 hours/day * 4 days/week = <<3*4=12>>12 hours/week Then find the total time Carly practices the backstroke stroke in a week: 2 hours/day * 6 days/week = <<2*6=12>>12 hours/week Then add those two amounts of time to find her total practice time each week: 12 hours/week + 12 hours/week = <<12+12=24>>24 hours/week Then multiply her weekly practice time by the number of weeks in a month to find her monthly practice time: 24 hours/week * 4 weeks/month = <<24*4=96>>96 hours/month #### 96 There are 248 pages in a book. Joanna can read 16 pages per hour. On Monday, she reads for 3 hours. On Tuesday, she reads for 6.5 hours. How many more hours does she need to read to finish the book? On Monday, Joanna reads 3*16=<<3*16=48>>48 pages. On Tuesday, Joanna reads 6.5 * 16 =<<6.5*16=104>>104 pages. So far, she has read 48 +104 =<<48+104=152>>152 pages. Thus, she has 248-152 = <<248-152=96>>96 pages left. She will need to read for 96/16 = <<96/16=6>>6 hours to finish the book. #### 6 A baker bought cooking ingredients in the supermarket. She bought 3 boxes of flour that cost $3 each box, 3 trays of eggs that cost $10 for each tray, 7 liters of milk that cost $5 each liter, and 2 boxes of baking soda that cost $3 each box. How much will she have to pay for everything? The total cost for the flour is 3 x $3 = $<<3*3=9>>9. The total cost of the tray of eggs is 3 x $10 = $<<3*10=30>>30. The total cost for the liter of milk is 7 x $5 = $<<7*5=35>>35. The total cost for the box of baking soda is 2 x $3 = $<<2*3=6>>6. Therefore, the total cost for all the ingredients is $9 + $30 + $35 + $6 = $<<9+30+35+6=80>>80. #### 80 Timothy and Theresa go to the movies very often. Timothy went to the movies 7 more times in 2010 that he did in 2009. In 2009, Timothy went to the movies 24 times. In 2010 Theresa went to see twice as many movies as Timothy did, but in 2009, she only saw half as many as he did. How many movies did Timothy and Theresa go on in both 2009 and 2010? In 2010 Timothy watched 24+7 = <<24+7=31>>31 movies. In 2010 Theresa watched 31*2 = <<31*2=62>>62 movies. In 2009 Theresa watched 24/2 = <<24/2=12>>12 movies. In both 2009 and 2010 Timothy and Theresa watched 24+31+62+12 = <<24+31+62+12=129>>129 movies. #### 129 Samara and three of her friends heard alligators spotted on the local river and decided to join a search organized by the wildlife service to capture the animals. After searching the whole day, Samara had seen 20 alligators while her friends had seen an average of 10 alligators each. Calculate the total number of alligators Samara and her friends saw. Each of Samara's friends saw an average of 10 alligators each, a total of 3*10 = <<3*10=30>>30 alligators. Together, Samara and her friends saw 30+20 = <<30+20=50>>50 alligators. #### 50