An algebra problem by Javed Siddiqui

Algebra Level 1

Sally is 54 years old and her mother is 80, how many years ago was Sally’s mother three times her age?

13 years 41years 54 years

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Javed Siddiqui by Javed Siddiqui , 23, Pakistan

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2 solutions

Let x x be the number of years ago when Sally’s mother was three times her age. we have

m − x = 3 ( s − x ) m-x=3(s-x)

Substitute.

80 − x = 3 ( 54 − x ) 80-x=3(54-x)

80 − x = 162 − 3 x 80-x=162-3x

2 x = 82 2x=82

x = 41 x=41

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Javed Siddiqui
Aug 7, 2016

Answer: 41 years ago, when Sally was 13 and her mother was 39.

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