Mrs. Brock sealed the metal tube.

1-2/5- 1/3= 1-6/ 15-5/ 15=4/ 15

Answer; There are four fifths left.

Solution: Wenwen is X years old this year.

5x+7=3(x+7)

5x+7=3x+2 1

2x= 14

x=7

A: Wen Wen is 7 years old this year.