Nancy spent half of her allowance going to the movies. She washed the family

car and earned 7 dollars. What is her weekly allowance if she ended with

16 dollars?

Nancy's weekly allowance is

12

dollars.

Explanation:

Ler weekly allowance be

x

dollars.

She spent half of it i. e.

x

2

going to movies. Her balance was

x

-

x

2

.

She then earned

7

by washing family car, which made her balance

x

-

x

2

+

7

.

As she ended with

13

dollars, we have

x

-

x

2

+

7

=

13

or

x

2

=

13

-

7

=

6

Hence

x

=

6

*

2

=

12

and

Nancy's weekly allowance is

12

dollars.