Question: On Miss Lawrence's math exam, 80% of the 50 questions are problem-solving while the rest are multiple-choice questions. How many multiple-choice questions are there?
Answer: Step-by-step reasoning process: 100% - 80% = 20% of Miss Lawrence's exam are multiple - choice questions. Thus, there are 50 x 20 / 100 = 10 multiple - choice questions.
So the answer is 10.

Question: There are 4 wolves out hunting for the pack. The pack contains 16 additional wolves. Each wolf needs to eat 8 pounds of meat a day and the wolves won't hunt again for five days. If each deer contains 200 pounds of meat, how many deer does each wolf need to kill?
Answer: Step-by-step reasoning process: The wolf pack has 20 members because 4 + 16 = 20. They need 160 pounds of meat a day because 20 x 8 = 160. They need 800 pounds to last five days because 5 x 160 = 800. The hunters need to kill 4 deer because 800 / 200 = 4. They each need to kill one deer because 4 / 4 = 1.
So the answer is 1.

Question: A luxury perfume costs $1200. The store owner decided to increase its price by 10% so that he could earn more profit. Few weeks had past but the perfume was still not sold. So, the owner decided to lower the price by 15%. By how much was the final price lower than the original price?
Answer: Step-by-step reasoning process: There was a $1200 x 10 / 100 = $120 increase of the original price. So, the perfume was priced for $1200 + $120 = $1320. Then, 15% of the new price is $1320 x 15 / 100 = $198. So, the final price is now $1320 - $198 = $1122. Therefore, the final price is $1200 - $1122 = $78 lower than the original price.
So the answer is 78.

Question: Every day, Sara bakes 10 cakes and puts them in his refrigerator. He does this for 5 days. Carol then comes over and eats 12 of his cakes. If it takes 2 cans of frosting to frost a single cake, how many cans of frosting does Bob need to frost the remaining cakes?
Answer:
Step-by-step reasoning process: After 5 days, Sara has baked 5 days * 10 cakes / day = 50 cakes. After Carol's feast, there are 50 cakes - 12 cakes = 38 cakes remaining. Sara needs 2 cans / cake * 38 cakes = 76 cans of frosting.
So the answer is 76.