09-05-2016
Mathematics

Answered

Sandra is 36 years old. Her son is 14 years old. How many years ago was Sandra 3 times older than her son? years ago

Verified Answer :

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09-05-2016

36
how many years ago (x years) was sandra (36-x) 3 times as old as son (at that time, 14-x)

sandra's age x years ago is 3 times son's age x years ago
36-x=3(14-x)
solve
distribute
36-x=42-3x
add 3x both sides
36+2x=42
minus 36
2x=6
divide 2
x=3

3 years ago
(36-3=33, 14-3=11, 11*3=33)

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