Tom bought 10 packages of miniature racing cars. Each package contains five cars. He gave each of his two nephews 1/5 of the cars. How many miniature racing cars are left with Tom? Give the rationale and then the answer.
Let's think step by step. Tom had 10 x 5 = 50 miniature racing cars. Tom gave 50 x 1 / 5 = 10 miniature racing cars to each of his two nephews. So, he gave a total of 10 x 2 = 20 cars to his two nephews. Therefore, Tom is left with 50 - 20 = 30 miniature racing cars.. The answer is: 30.

John buys 20 bars of soap each weighing 1.5 pounds for $.5 per pound. How much money did he spend on soap? Give the rationale and then the answer.
Let's think step by step. He bought 20 * 1.5 = 30 pounds of soap. That cost 30 * .5 = $15.. The answer is: 15.

A dime has the same value as 10 pennies and a nickel has the same value as 5 pennies. How many pennies will Grace have by exchanging her 10 dimes and 10 nickels? Give the rationale and then the answer.
Let's think step by step. Grace will have 10 x 10 = 100 pennies from her dimes. She will have 10 x 5 = 50 pennies from her nickels. Therefore, she will have a total of 100 + 50 = 150 pennies.. The answer is: 150.