Question

Your brother is 1/3 your age. Your sister is 4 years older than your brother. Your sister is 9 years old. Write and solve an equation to find your age a.An equation is _=9You are _ years old.

Answer 1

Let

x ------> My age

y -----> your brother's age

z ----> your sister's age

we know that

y=(1/3)x ------> equation A

z=y+4 -----> equation B

z=9 -----> equation C

step 1

Find the value of y

z=y+4

9=y+4

y=9-4

y=5

step 2

Find the value of x

y=(1/3)x

5=(1/3)x

x=15 years old

therefore

You are 15 years old.