Chelsea made 4 batches of cupcakes for the bake sale. The cupcakes took 20 minutes to bake and 30 minutes to ice per batch. How long did it take Chelsea to make the cupcakes?

Chelsea baked 4 batches of cupcakes x 20 minutes each =

<<4*20=80>>80 minutes of baking. She iced 4 batches of cupcakes x 30 minutes each = <<4*30=120>>120 minutes. It took Chelsea 80 + 120 = <<80+120=200>>200 minutes to make the cupcakes for the bake sale. #### 200 Miriam currently has 30 marbles, but she used to have more. Miriam gave her brother 60 marbles, gave her sister twice that amount and gave her friend Savanna three times the amount she currently has. How many marbles did Miriam start with? If Mariam remains with 30 marbles after giving her brother 60 marbles, she had 30+60 = <<30+60=90>>90 marbles. Mariam's sister receives twice as many marbles as her brother, a total of 2*60 = <<2*60=120>>120 marbles. The total number of marbles before giving any to her brother or sister is 120+90= <<120+90=210>>210 Savannah is to receive three times as many marbles as Mariam has to remain with, a total of 3*30 = <<3*30=90>>90 marbles. Before giving out any marble, Mariam has 210+90 = <<210+90=300>>300 marbles. #### 300 Cersei bought 50 cotton candies. She gave her brother and sister 5 cotton candies each, then gave the remaining one-fourth of them to her cousin. If she ate 12 cotton candies, how many cotton candies are left? Cersei gave a total of 5 x 2 = <<5*2=10>>10 cotton candies to her brother and sister. So, the total cotton candies left were 50 - 10 = <<50-10=40>>40. And she gave 1/4 x 40 = <<1/4*40=10>>10 cotton candies to her cousin. So, the total number of cotton candies left was 40 - 10 = <<40-10=30>>30. Therefore, the total number of cotton candies left after she ate 12 of them is 30 - 12 = <<30-12=18>>18. #### 18 Mark collects money for the homeless. He visits 20 households a day for 5 days and half of those households give him a pair of 20s. How much did he collect? He got money from 20/2=<<20/2=10>>10 households per day So that means he got money from 10*5=<<10*5=50>>50 households Each of those houses gave 20*2=$<<20*2=40>>40 So he raised 40*50=$<<40*50=2000>>2000 #### 2000 A party hall has 3 decorative light bulbs; a red light bulb which comes on every 2 seconds, a green one every 3 seconds and a blue one every 4 seconds. If they are put on at the same time, what is the shortest time after which the three bulbs will be on at the same time? The blue light bulb comes on every 2 seconds so it will be on after 2, 4, 6, 8, 10, 12, 14... seconds (multiples of 2) The red light bulb comes on every 3 seconds so it will be on after 3, 6, 9, 12, 15, 18... seconds (multiples of 3) The blue light bulb comes on every 4 seconds so it will be on after 4, 8, 12, 16, 20... seconds (multiples of 4) The shortest time after which all three will be on is 12 seconds which is the least common multiple of the set of multiples. #### 12 Maria went on a trip to Belgium. She paid $300 for the ticket and half of that for the hotel. How much money does she have left, when she had $760 at the beginning? For the hotel Maria paid 300 / 2 = $<<300/2=150>>150. So Maria has 760 - 300 - 150 = $<<760-300-150=310>>310 left. #### 310 Randy had some money. Smith gave him another $200. Randy then gave Sally $1,200 and kept the rest. If Randy has $2000 left, how much money, in dollars, did Randy have at first? After Smith gave him $200, Randy had 2000+1200=<<2000+1200=3200>>3200 dollars. Randy had 3200-200=<<3200-200=3000>>3000 dollars at first. #### 3000 Johnny makes his signature crab dish 40 times a day. It uses 1.5 pounds of crab meat. Crab meat sells for $8 per pound. How much does he spend in a week if he is closed 3 days a week? He uses 40*1.5=<<40*1.5=60>>60 pounds of crab meat per day That cost 60*8=$<<60*8=480>>480 per day He is open 7-3=<<7-3=4>>4 days a week So he spends 480*4=$<<480*4=1920>>1920 a week #### 1920 Evan owns 40 fewer books than the number he had 2 years ago. Evan will have 60 more than five times as many books as he owns now in five years. If Evan had 200 books two years ago, calculate the total number of books he will have in five years. If Evan had 200 books two years ago, he currently has 200-40 = <<200-40=160>>160 books. In five years, Evan will have 60 more than 160*5 = 800 books which is the number he has now. This means Evan will have 800+60 = <<800+60=860>>860 books in five years. #### 860 Enrique has 2 132 contracts that he needs to shred. His paper shredder will only allow him to shred 6 pages at a time. How many times will he shred 6 units of paper until all of the contracts are shredded? He has 2 contracts that are 132 pages each so that's 2*132 = <<2*132=264>>264 pages He can only shred 6 pages at a time so it will take him 264/6 = <<264/6=44>>44 units #### 44