Question

Write the following statements in equation form: If the sum of a number and its two fifth is 70

Answer 1

Answer:

$x + \frac{2}{5} \times x = 70 \\ x + \frac{2}{5} x = 70$

Answer 2

Answer:

Let it be x the number.

We have to sum to x two fifths of him and we know the result is 70, so:

$x + \frac{2}{5}x = 70$

We could also solve it:

$\frac{5x}{5}+\frac{2x}{5}=\frac{350}{5}$

$5x + 2x = 350$

$7x = 350$

$x=\frac{350}{7}=50$