Tessa Is 9 Yrs. Younger Than Marie.The Sum Of Their Ages Is 69 .Find There Present Age?

Tessa is 9 yrs. younger than marie.The sum of their ages is 69 .Find there present age?

Answer:

Marie is 39 years old while Tessa is 30 years old.

Step-by-step explanation:

Representation:

Marie: x

Tessa: x - 9

Equation:

x + x - 9 = 69

Solution by Transposition:

x + x - 9 = 69

2x - 9 = 69

2x = 69 + 9

2x = 78

$\frac{2x}{2}=\frac{78}{2}$

x = 39

Substitute:

Marie: x

Tessa: x - 9

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