Answer this question:A public official wants to donate 5 new soccer balls per each class in two schools. Each school has 4 elementary school classes and 5 middle school classes. How many soccer balls would the public official donate in all?
Each school has 4 + 5 = 9 classes. So, there are a total of 9 x 2 = 18 classes for the 2 schools. Therefore, the public official donates a total of 18 x 5 = 90 soccer balls.
The answer is 90.

Answer this question:Giorgio plans to make cookies for his class. There are 40 students and he plans to make 2 cookies per student. If 10% of his classmates want oatmeal raisin, then how many oatmeal raisin cookies will Giorgio make?
40 students want oatmeal raisin because 40 x .1 = 4. He makes 8 oatmeal raisin cookies because 4 x 2 = 8.
The answer is 8.

Answer this question:A certain store sells computer accessories and equipment. Due to a fire outbreak in one of the factories, the price of RAM increased by 30%. After two years, the price stabilized and finally fell by 20% from what it has risen. What is the current price of RAM if it was $50 before the fire?
After the fire outbreak, the price of RAM got increased by 30 / 100 * 50 = $15. So before stabilization the price was at 50 + 15 = $65. After the stabilization, the price fell by 20% from $65, so it fell by 20 / 100 * 65 = $13. That means the RAM is currently at 65 - 13 = $52.
The answer is 52.

Answer this question:Rose had 10 kilograms of rice. She cooked 9/10 kilograms in the morning and 1/4 of the remaining in the evening. How many grams of rice did she have left?
Rose cooked 10 x 9 / 10 = 9 kilograms of rice in the morning. She had 10 - 9 = 1 kilogram of rice left then. One kilogram is equal to 1 x 1000 = 1000 grams. So, Rose cooked 1000 x 1 / 4 = 250 grams of rice in the evening. Therefore, she has 1000 - 250 = 750 grams of rice left.
The answer is 750.