[Question]: John buys 1.5 ounces of silver and twice as much gold. The silver costs $20 per ounce. The gold is 50 times more expensive per ounce. How much does he spend on everything?
[Answer]: He buys the silver for 1.5 * $20 = $30. He bought 1.5 * 2 = 3 ounces of gold. The gold is worth %20 * 50 = $1000 per ounce. So he buys 3 * $1000 = $3000 on gold. So he spent $30 + $3000 = $3030 on everything.
So the answer is 3030.

[Question]: Last night, Olive charged her phone for 10 hours. Assuming each hour of charge lasts the phone 2 hours of use, calculate the total time Olive would be able to use her phone before it goes off if she charges it for 3/5 of the time she charged the phone last night.
[Answer]: If Olive charges her phone for 3 / 5 of the time she charged the phone last night, the phone would be charged for 3 / 5 * 10 = 6 hours. Assuming each hour of charge lasts the phone 2 hours of use, the phone will last for 6 * 2 = 12 hours before it goes off when Olive uses it on a six hours charge.
So the answer is 12.

[Question]: John works 12 hours every other day. He gets a 30% raise from his former $20 an hour job. How much does he make in a 30 day month?
[Answer]:
He works 30 / 2 = 15 days. So he works 15 * 12 = 180 hours in the month. He got a 20 * .3 = $6 an hour raise. So he gets paid 20 + 6 = $26 an hour. That means he makes 26 * 180 = $4680.
So the answer is 4680.