If there are four times as many red crayons as blue crayons in a box, and there are 3 blue crayons. How many crayons total are in the box?

Red crayons: 4(3)=12

Total crayons: 12+3=

<<12+3=15>>15 crayons #### 15 Brenda raises mice, and her adult mice recently had three litters of 8 each. She gave a sixth of the baby mice to her friend Robbie to keep as pets. She sold three times the number of babies she gave Robbie to a pet store. Half of the remaining mice were sold to snake owners as feeder mice. How many baby mice did Brenda have left? Brenda’s mice had 3 * 8 = <<3*8=24>>24 baby mice. She gave Robbie 24 / 6 = <<24/6=4>>4 mice. Thus, she sold 3 * 4 = <<3*4=12>>12 mice to the pet store. She had 24 - 12 - 4 = <<24-12-4=8>>8 mice remaining. She sold 8 / 2 = <<8/2=4>>4 as feeder mice. Thus, Brenda had 8 - 4 = <<8-4=4>>4 mice left. #### 4 A magazine costs $3 each. Jewel bought 10 magazines to be sold at $3.50 each. How much will be Jewel gain from selling these? Jewel's gain for each magazine is $3.50 - $3 = $<<3.5-3=0.50>>0.50. Thus, her total gain will be $0.50 x 10 = $<<0.50*10=5>>5. #### 5 Leila went to the supermarket to get some groceries. Then she headed to her mechanic to get her automobile fixed. If fixing her automobile cost $350 which was $50 more than thrice the amount she spent at the supermarket, how much has she spent altogether? Reversing the steps to obtain the amount she spent at the supermarket, $50 less than $350 is $350-$50 = $<<350-50=300>>300 If $300 was thrice the amount she spent at the supermarket, then the amount spent at the supermarket was $300/3 = $<<300/3=100>>100 In addition to what she spent fixing her auto, she spent $100+$350 = $<<100+350=450>>450 altogether #### 450 On a shopping trip in a crowded store, Josie had to wait 3 minutes for a cart, 13 minutes for an employee to unlock a cabinet to get her a product, 14 minutes for a stocker to restock a shelf with what she wanted, and 18 minutes in line to check out. Her shopping trip took an hour and a half. How many minutes did Josie spend shopping instead of waiting? There are 60 minutes in an hour, so the trip took 1 1/2 * 60 = 90 minutes. Josie spent 3 + 13 + 14 + 18 = <<3+13+14+18=48>>48 minutes waiting. Thus, she spent 90 - 48 = <<90-48=42>>42 minutes shopping. #### 42 In 10 years, Terry will be 4 times the age that Nora is currently. If Nora is currently 10 years old, how old is Terry now? Terry will be 4*10=<<4*10=40>>40 years old in 10 years Currently, Terry is 40-10 = <<40-10=30>>30 years old. #### 30 A frog lays 800 eggs a year. 10 percent dry up, and 70 percent are eaten. 1/4 of the remaining eggs end up hatching, how many frogs hatch out of the 800? Dried up:800(.10)=80 eggs 800(.70)=560 eggs Total left:800-80-560=<<800-80-560=160>>160 eggs 160/4=<<160/4=40>>40 eggs survive to hatch #### 40 Elvis is releasing a new album with 10 songs, but he doesn't want to waste too much time on writing. He spends 5 hours in the studio, where he writes, records, and edits his songs. Each song takes 12 minutes to record, then it takes 30 minutes to edit all of his songs. How many minutes did it take Elvis to write each song, if each song took the same amount of time to write? 5 hours in the studio is the same as 5 * 60 = <<5*60=300>>300 minutes. To record all of his songs, Elvis takes 12 * 10 = <<12*10=120>>120 minutes. After editing and recording 300 – 120 – 30 = <<300-120-30=150>>150 minutes are left to write all of his songs. Songwriting therefore took 150 / 10 = <<150/10=15>>15 minutes per song. #### 15 Teresa scored 70 marks in science, 80 in music, 85 in social studies, and the physics exam, which was the hardest test that Teresa had ever taken in her entire life, she scored half as many marks as she scored in music. Calculate the total marks Teresa scored in all the subjects. The total marks of science and music are 70+80 = <<70+80=150>>150 When you add the marks she scored in social studies, the full marks become 150+85 = <<150+85=235>>235. She scored half as many marks in physics as she scored music, totaling 1/2*80 = 40 marks. When you add the marks she scored in physics to the total marks of the other subjects, the full marks become 235+40 = <<235+40=275>>275 #### 275 Brian likes to read books. He read one book that had 20 chapters, two books that had 15 chapters each, and one book that had half the chapters of the three previous books put together. How many chapters of books did Brian read? Brian read two books with 15 chapters, so he read 2*15=<<2*15=30>>30 chapters. He also read a book with 20 chapters, bringing the total for the first three to 30+20=<<30+20=50>>50 chapters. He then read a book with half the chapters of his cumulative total so far, so it had 50/2=<<50/2=25>>25 chapters In total, he read 30+20+25=<<30+20+25=75>>75 chapters. #### 75