Answers

  • Brainly User
2016-07-14T07:54:37+08:00
Let the amount in full of the tank: x

 \frac{1}{3}x + 21 =  \frac{4}{5} x

LCD: 15
Multiply each term by 15, then simplify.

15 [ \frac{1}{3} x + 21 =  \frac{4}{5} x ]15

5x + 315 = 12x

12x - 5x = 315

7x = 315

7x/7 = 315/7

x = 45

ANSWER:  B.  45 gallons

0