Question

The price of gasoline was C cents at the beginning of the

month. What was the price, in cents, after it went down 3
cents, doubled, and then went up 7 cents?
(A) C-10
(B) C-4
(C) C+8
(D) 2C+1

Answer 1

Option (D) 2C+1

Explanation:

we know that

C -----> is the original price in cents of the gasoline at the beginning of the month

so

First

The price went down 3 cents

so

Subtract 3 cents from the original price C

The new price is -----> (C-3) cents

Second

The price is doubled

Multiply by 2 the actual price of the gasoline

The actual price is (C-3)

so

2(C-3)=(2C-6) cents

Third

The price went up 7 cents

Adds 7 cents to the actual price of the gasoline

The actual price is (2C-6)

so

(2C-6)+7=2C+1