Question

Please help!!!

1) Twelve decreased by 4 times a number is equal to twice the number. What is the number?

2) the sum of a number and five more than the number is 17. What is the number?

3) during the summer frank earned $60 less than three times as much as his brother Fred. Together they earned $1220. How much did each earn

Answer 1

1) the answer is 2, 12 - 4x = 2x, x=2.
2) x + (x+5) = 17, 2x = 12, x=6.
3) x + (3x-60) = 1220, 4x = 1280. So Fred, x, made $320. Frank made $900.