Marcia is 10 years younger than twice her sister’s age. Her sister is 8 younger than Marcia. What is the age of Marcia?

Answer 1

M = 2S-10

S= M-8

M=S+8

2S-10 = S +8

S = 18 years old for sister

Marcia = 18+8 = 26 years old

26=2(18)-10 = 36-10

18=26-8