exam
Maths Puzzle
Numerical Ability
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?
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