SOLUTION: Serina is 9 years old. Her mom is 39 years old. In how many years will her mother be 3 times as old as Serena? 9 + 39 = 3x (9+39) 48 = 27x + 117x 48 = 144x x = 3 but it sho

Question 100765: Serina is 9 years old. Her mom is 39 years old. In how many years will her mother be 3 times as old as Serena?
9 + 39 = 3x (9+39)
48 = 27x + 117x
48 = 144x
x = 3 but it should be 6 what did I do wrong?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
let x be the numer of years.

39+x=3(9+x) multiply both sides times the denominator.
39+x=27+3x
2x=12 subtract x and 27 from each side.
x=6 divide 2 into each side.
Check:
39+6=45
9+6=15
45/15=3
Ed
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