Question

The total of the ages of A, B and C is 70 years. What was the total of their ages three years ago​

Answer 1

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Answer 2

Given:

• The ages of A, B, and C = 70 years.

To Find:

• The total age of A, B, and C three years ago.

Solution:

Let A = $x_1$, B = $x_2$, and C = $x_3$

From the given question we can write,

A+B+C = $x_1+x_2+x_3$  = 70

To find ages of them three years ago we have to subtract.

⇒ $(x_1-3)+(x_2-3)+(x_3-3)$ = 70 {removing the bracket and adding}

⇒ $x_1+x_2+x_3$-9 = 70 {shifting like terms to one side}

⇒ $x_1+x_2+x_3$ = 70 -9 = 61 years. {subtracting the terms}

∴ The total age of A, B, and C three years ago = 61 years.