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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
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 :)
 figure it out.
thxs

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