Question

Which number should come in place of ?
$\frac{1}{7}+\frac{2}{7}+\frac{}{7}=1\frac{3}{7}$

• A. $1$
• B. $2$
• C. $3$
• D. $7$

Answer 1

The correct option is D $7$

Given, $\frac{1}{7}+\frac{2}{7}+\frac{.....}{7}=\frac{10}{7}$

Let the unknown number be $x$

$\therefore \frac{1}{7}+\frac{2}{7}+\frac{x}{7}=1\frac{3}{7}$

$\therefore \frac{x}{7}=\frac{10}{7}-\frac{3}{7}$

$x=7$