Marisa is nine years older than her sister, and the sum of their ages is 32

Question

what is an equation made from this problem?

Answer 1

s = sister's age

m = Marisa's age = s + 9

 

m + s = 32

 

(s + 9) + s = 32

 

s = (32 - 9)/2 = 11.5 years

m = 11.5 + 9 = 20.5 years