Question

jane is twice as old as Barbara. Michael is 7 years older than Jane. If Michael is 21, which equation could be used to find Barbara's age

Answer 1

Explanation:

J = 2b

M = J + 7

M = 21

J = 21 - 7

J = 14

B = 7

Equation:

If M is J+7, so then J = 21-7. J is 2*b, so 2*b = 21-7. Then you subtract and divide.