Question

What will be the third number if two numbers are 3/10 and -2/5 if their sum is -1/5

Answer 1

Given:

• first no. = $\frac{3}{10}$
• second no. =$\frac{ - 2}{5}$
• sum of three no's = $\frac{ - 1}{5}$

To find:

• third number

Answer:

$\longrightarrow$$first \: no. \: + \: second \: no. \: + \: third \: no. \: = \: \frac{ - 1}{5}$

$\longrightarrow$$\frac{3}{10} + \frac{ - 2}{5} + \: \frac{? }{?} = \frac{ - 1}{5}$

Let third no. be x

$\longrightarrow$$\frac{ 3}{10} + \frac{ - 2}{5} + x = \frac{ - 1}{5}$

$\longrightarrow$$\frac{3 + ( - 4) + 10x}{10} = \frac{ - 1}{5}$

$\longrightarrow$$\frac{3 - 4 + 10x}{10} = \frac{ - 1}{5}$

$\longrightarrow$$- 1 + 10x = \frac{ - 10}{5}$

$\longrightarrow$$- 1 + 10x = - 2$

$\longrightarrow$$10x = - 2 + 1$

$\longrightarrow$$10 x= - 1$

$\longrightarrow$$x = \frac{ - 1}{10}$

hence ,answer $\sf {\boxed {\pink { </strong><strong>-</strong><strong>1</strong><strong>/</strong><strong>1</strong><strong>0</strong><strong>}}}$