[Question]: A sixty bulb watt uses 60 watts of power each day. If Allyn has 40 such bulbs in his house and pays an electricity bill of twenty cents per power watt used, calculate Allyn's total monthly expenses on electricity in June.
[Answer]: If each bulb uses 60 watts each day, the 40 bulbs that Allyn has uses 60 * 40 = 2400 watts of power each day. In June, with 30 days, the bulbs will use 30 * 2400 = 72000 watts of power. If Allyn is charged an electricity bill of twenty cents per power watt used, in June she will pay 72000 * $0.20 = $14400.
So the answer is 14400.

[Question]: Tim and Donna will celebrate their 20th wedding anniversary in 2025. They started dating 3 years before they got married and met 2 years before that. When did they meet?
[Answer]: They'll celebrate their 20th wedding anniversary in 2025 which means they got married in 2025 - 20 = 2005. They started dating 3 years before they got married in 2005 which means they started dating in 2005 - 3 = 2002. And they met 2 years before they started dating which means they met in 2002 - 2 = 2000.
So the answer is 2000.

[Question]: Djibo is 17 years old. Five years ago Djibo added his age with his sister's age and the sum was 35. How many years old is Djibo's sister today?
[Answer]:
Age 5 years ago: 17 - 5 = 12. Sister's age 5 years ago: 35 - 12 = 23. Sister's age today: 23 + 5 = 28 years. Djibo's sister is 28 years old today.
So the answer is 28.