Jamal bought 4 half dozen colored crayons at $2 per crayon. What was the total cost of the crayons that she bought?

Since a dozen has 12 items, a half dozen has 1/2*12=

<<6=6>>6 items. Since Jamal bought four half dozen colored crayons, he bought 4*6 = <<4*6=24>>24 colored crayons. If each crayon's cost was $2, Jamal paid $2*24 = $<<2*24=48>>48 for all the crayons he bought. #### 48 Harry is joining a marathon that's why he practices and varies his workouts from day to day. He ran 10 meters per hour on Monday. From Tuesday to Thursday he ran 50% faster than on Monday. Then on Friday, he ran 60% faster than he ran on Thursday. How fast did Harry run on Friday? Harry ran 10 x 50/100 = <<10*50/100=5>>5 meters per hour faster on Tuesday to Wednesday. So he ran 10 + 5 = <<10+5=15>>15 meters per hour from Tuesday to Thursday. Then on Friday, he ran 15 x 60/100 = <<15*60/100=9>>9 meters per hour more. Therefore, he ran 15 + 9 = <<15+9=24>>24 meters per hour on Friday. #### 24 The length of a rectangle is four times its width. If the area is 100 m2. what is the length of the rectangle? Let L be the length and W be the width of the rectangle. Hence L = 4* W We now use the area to write 80 = L * W Substitute L by 4 W in the equation above 80 = 4*W × W = 4 W^2 Solve for W and find L 4 W^2 = 100 W^2 = 25, W = 5 and L = 4*5 = <<4*5=20>>20 m #### 20 A shop sold 29 bags of potatoes in the morning. In the afternoon, the shop sold 17 bags of potatoes. If each bag of potatoes weighs 7kg, how many kilograms of potatoes did the shop sell for the whole day? They sold in the morning and afternoon for a total of 29+17 = <<29+17=46>>46 bags Each bag weighs 7kg so 46 bags weigh 46*7kg = 322kg #### 322 It's Yvette's turn to treat herself and her three best friends to a round of ice cream sundaes. Alicia orders the peanut butter sundae for $7.50. Brant orders the Royal banana split sundae for $10.00. Josh orders the death by chocolate sundae for $8.50 and Yvette orders the cherry jubilee sundae for $9.00. She leaves her waiter a 20% tip. How much will her final bill be? Yvette spent 7.50+10+8.5+9 = $<<7.50+10+8.5+9=35.00>>35.00 on ice cream sundaes Her bill comes to $35.00 and she leaves a 20% tip for the waiter so that's 35*.20 = $7.00 The bill was $35.00 and she added a $7.00 tip for a total of 35+7 = $<<35+7=42.00>>42.00 #### 42 Tom swims for 2 hours at a speed of 2 miles per hour. He then runs for half the time at 4 times the speed. How many miles did he cover? He swam 2*2=<<2*2=4>>4 miles He ran for 2/2=<<2/2=1>>1 hour His running speed was 2*4=<<2*4=8>>8 mph So he ran 8*1=<<8*1=8>>8 miles So his total distance was 8+4=<<8+4=12>>12 miles #### 12 Anna, Alison, and Jeff collect stamps. Anna had 37 stamps in her collection, Alison had 28 stamps in her collection, and Jeff had 31 stamps in his collection. Alison gave Anna half of her collection in exchange for a novel, and then Anna traded Jeff two bluebird stamps for one mountain stamp. How many stamps did Anna have in the end? Alison gave Anna 1/2 * 28 = 28/2 = <<1/2*28=14>>14 stamps. Adding Alison’s stamps to Anna’s collection means Anna has 14 + 37 = <<14+37=51>>51 stamps. Then Anna traded Jeff 2 stamps, so she had 51 - 2 = <<51-2=49>>49 stamps. Anna got 1 stamp back in the trade, so she had 49 + 1 = <<49+1=50>>50 stamps in the end. #### 50 Luna, the poodle, is supposed to eat 2 cups of kibble every day. But Luna's master, Mary, and her husband, Frank, sometimes feed Luna too much kibble. One day, starting with a new, 12-cup bag of kibble, Mary gave Luna 1 cup of kibble in the morning and 1 cup of kibble in the evening, But on the same day, Frank also gave Luna 1 cup of kibble in the afternoon and twice as much in the late evening as he had given Luna in the afternoon. The next morning, how many cups of kibble will Mary find remaining in the bag? Mary fed Luna 1+1=2 cups of kibble. Frank fed Luna 1-cup plus twice 1-cup, or 1+2=3 cups of kibble. In total, they fed Luna 2+3=<<2+3=5>>5 cups of kibble. Thus, if the new bag held 12 cups of kibble, the next morning, 12-5=<<12-5=7>>7 cups of kibble remained in the bag. #### 7 Faith went to a baking shop and bought flour that cost $5 and a cake stand that costs $28. She then gave the cashier two $20 bills and $3 in loose coins. How much change will she receive? Faith must pay $28 + $5 = $<<28+5=33>>33 for the flour and cake stand. Her two $20 bills amount to $20 x 2 = $<<20*2=40>>40. So, she gave the cashier a total of $40 + $3 = $<<40+3=43>>43. Hence, her change is $43 - $33 = $<<43-33=10>>10. #### 10 Tom wants to make the world's largest dough ball. He needs 500 pounds of flour and he can buy 50-pound bags of flour for $20. He also needs 10 pounds of salt and salt cost $.2 a pound. He also spends $1000 promoting everything. He then sells tickets for $20 each and sells 500 tickets. How much money did he make? He needs 500/50=<<500/50=10>>10 bags of flour That cost 20*10=$<<20*10=200>>200 He needs 10*.2=$<<10*.2=2>>2 worth of salt So everything cost 1000+200+2=$<<1000+200+2=1202>>1202 He makes 20*500=$<<20*500=10000>>10,000 selling tickets So he makes a profit of 10000-1202=$<<10000-1202=8798>>8798 #### 8798