pre algebra help

have been stuck on this problem for and hour
Problem: Mary’s sister is 7 years older tha Mary. their combined ages add up to 35. How old is Mary.

If you can help thanks

Answer #1

Mary’s age is going to be X Mary’s sister’s age is going to be Y Their combined ages = Z

x = ? y = x +7 z = x+ y = x + x + 7

z = 2x +7 35 = 2x +7

2x = 35 - 7 = 28 x = 28 / 2 = 14 Mary’s age is 14 and her sister is 21 (14+7) Step by step :)

Answer #2
  1. figure it out.
Answer #3

thxs

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