[Question]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?
[Answer]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.

[Question]Three years ago, Bethany was twice the age of her younger sister. In 5 years, her younger sister will be 16. How old is Bethany now?
[Answer]First find how old Bethany's sister currently is: 16 years - 5 years = 11 years. Then find how old her sister was 3 years ago: 11 years - 3 years = 8 years. Then double that age to find how old Bethany was three years ago: 8 years * 2 = 16 years. Then add 3 years to that number to find how old Bethany is now: 16 years + 3 years = 19 years. The answer is 19.

[Question]Weng earns $12 an hour for babysitting. Yesterday, she just did 50 minutes of babysitting. How much did she earn?
[Answer]Weng earns 12 / 60 = $0.2 per minute. Working 50 minutes, she earned 0.2 x 50 = $10. The answer is 10.

[Question]Wendy works at a chocolate factory packing chocolates. She can package 2 dozen chocolates in 5 minutes. How many individual chocolates can she package in 4 hours?
[Answer]
There are 60 minutes in an hour and she packs chocolate in 5 - minute increments. So that's 60 / 5 = 12 5 minute increments in 1 hour. 12 chocolates make 1 dozen and she packages 2 dozen in 5 minutes so that's 12 * 2 = 24 chocolates in 5 minutes. 12 5 minute increments are in an hour and she packages 24 chocolates in 5 minutes so she can package 12 * 24 = 288 individual chocolates in 1 hour. If she packages 288 individual chocolates in 1 hour then in 4 hours she can package 288 * 4 = 1,152 individual chocolates. The answer is 1152.