Noel bakes 4 dozen donuts for his class. There are 30 students in class, but only 80% like donuts. How many donuts does each student who likes donuts get to eat?

He makes 48 donuts because 4 x 12 =

<<4*12=48>>48 24 students want to eat donuts because 30 x .8 = <<30*.8=24>>24 They can each eat 2 donuts because 48 / 24 = <<48/24=2>>2 #### 2 In the last 25 years, 60% of Scrabble champions have been women and the rest have been men. There is one champion per year. Of the men, 40% had a beard. How many men with beards have been Scrabble champion? 40% of champions are men because 100 - 60 = <<100-60=40>>40 10 champions have been men because 25 x .4 = <<25*.4=10>>10 4 champions have been men with beards because 10 x .4 = <<10*.4=4>>4 #### 4 Tom went to the store to buy fruit. Lemons cost $2, papayas cost $1, and mangos cost $4. For every 4 fruits that customers buy, the store offers a $1 discount. Tom buys 6 lemons, 4 papayas, and 2 mangos. How much will he pay? For 6 lemons, Tom will pay 6 * 2 = $<<6*2=12>>12. For 3 papayas, he will pay 3 * 1 = $<<3*1=3>>3 For 2 mangos, he will pay 2 * 4 = $<<2*4=8>>8. In total, the cost of the fruits before discount is 12 + 4 + 8 = $<<12+4+8=24>>24. The total number of fruits is 6 + 4 + 2 = <<6+4+2=12>>12 fruits. For 12 fruits, Tom gets a discount of 12 / 4 = $<<12/4=3>>3. Subtracting the discount offered by the store, Tom will pay 24 - 3 = $<<24-3=21>>21. #### 21 Josh has soccer practice on Monday, Wednesday, and Friday from 3:00 p.m. to 5:00 p.m. He has band practice on Tuesday and Thursday from 3:30 p.m. to 5:00 p.m. From Monday to Friday, how many hours does Josh spend on extracurricular activities? Josh practices soccer 2 hours x 3 days = <<2*3=6>>6 hours. He practices band 1.5 hours x 2 days = <<1.5*2=3>>3 hours. From Monday to Friday, on extracurricular activities, Josh spends 6 + 3 = <<6+3=9>>9 hours. #### 9 After trick-or-treating, Brent dumped his candy on the table. He had received 5 Kit-Kat bars, three times that amount in Hershey kisses, 8 boxes of Nerds, and 11 lollipops. He also had 10 Baby Ruths and half that amount in Reese Peanut butter cups. After giving his little sister 5 lollipops, how many pieces of candy did Brent have left? He had 5 Kit-Kats and had 3 times that amount in Kisses so he had 5*3 = <<5*3=15>>15 Hershey kisses He had 10 Baby Ruths and half that amount in Reese Peanut butter cups so he had 10/2 = <<10/2=5>>5 Reese Peanut Butter cups He had 11 lollipops and gave 5 to his sister so he now had 11-5 = <<11-5=6>>6 lollipops When you add up all of the candy, he had 5 Kit-Kats, 15 Hershey kisses, 10 Baby Ruths, 5 Reese cups, 8 Nerds and 6 lollipops so 5+15+10+5+8+6 = <<5+15+10+5+8+6=49>>49 pieces of candy #### 49 Mike is shopping at the mall. He needs to buy a shirt, a new wallet, and some food for the evening. The shirt costs a third of the value of the wallet. The wallet is $60 more than the cost of the food, on which Mike spent $30. How much did Mike spend that day on the shopping? The wallet costs $60 more than the food, so it's $30 + $60 = $<<30+60=90>>90. So the cost of the shirt is 1/3 * $90 = $<<1/3*90=30>>30. Mike spent that day $30 + $30 + $90 = $<<30+30+90=150>>150. #### 150 Under standard growth conditions, the bacterial strain, E.coli, has a doubling time of 20 minutes. If 1 single bacterial cell is used to start a culture grown under standard growth conditions, how many bacterial cells will there be after the culture is grown for 4 hours? 4 hours is 4*60=<<4*60=240>>240 minutes. If the doubling time is 20 minutes, then after 240 minutes, the number of bacteria would have doubled 240/20=<<240/20=12>>12 times. Thus, starting with only 1 bacterial cell, after 4 hours, there will be 1*2*2*2*2*2*2*2*2*2*2*2*2= 4,096 bacterial cells #### 4,096 Lucy plans to purchase potato chips for a party. Ten people will be at the party, including Lucy. The potato chips cost 25 cents per pound. How much will Lucy pay (in dollars) for the potato chips if she wants each person to get 1.2 pounds? Lucy needs to purchase 10 x 1.2 = <<10*1.2=12>>12 pounds of potato chips. So, Lucy will pay 12 x 25 = <<12*25=300>>300 cents for it. Since there are 100 cents in $1, thus, Lucy will pay 300/100 = <<300/100=3>>3 dollars. #### 3 At Sarah's job 60% of the employees are women and the rest are men. Of the men, 75% have a college degree and 8 do not. How many women work at Sarah's company? 25% of men at the job don't have a college degree because 100 - 75 = <<100-75=25>>25 There are 32 men at the company because 8 / .25 = <<8/.25=32>>32 40% of the employees are men because 100 - 60 = <<100-60=40>>40 The company has 80 workers because 32 / .4 = <<32/.4=80>>80 There are 48 women at the company because 80 - 32 = <<80-32=48>>48 #### 48 The pet shop grooms dogs. It takes 30 minutes to groom a poodle. It takes half as much time to groom a terrier as it takes to groom a poodle. They do not groom cats. If the pet shop grooms 3 poodles and 8 terriers, what is the total length of time it will take, in minutes? At a rate of 30 minutes per poodle, 3 poodles will take 3*30=<<3*30=90>>90 minutes. If it takes half as much time to groom a terrier as it takes to groom a poodle, it takes 30/2=<<30/2=15>>15 minutes per terrier. At a rate of 15 minutes per terrier, 8 terriers will take 120 minutes. Thus, in total, it will take the pet shop 90+120=<<90+120=210>>210 minutes to groom 3 poodles and 8 terriers. #### 210