Question

hou much must be added to 2 times of 5/7 to get 3. let us calculate​

Answer 1

To find : what must be added to $2$ times of  $\frac{5}{7}$ to get $3$ .

Solution :  

• Let , $x$  be the number added to $2$ times of $\frac{5}{7}$ to get $3$ .
• Then as per given condition we write , $x + 2(\frac{5 }{7} ) = 3$  
• Using transposition method we find the value of $x$.

• $x + 2(\frac{5 }{7} ) = 3$  

        $x + \frac{10}{7} =3 \\x = 3 -\frac{10}{7} \\ x= \frac{21-10 }{7} \\x = \frac{11}{7}$

Hence , $\frac{11}{7}$ must be added to $2$ times of  $\frac{5}{7}$ to get $3$ .

Answer 2

Given: $2(\frac{5}{7} )+x=3$

We have to find the missing number.

• For this, we will separate the variables on one side and the constant on another side.  
• Then, we will simplify the equation.

We are solving in the following way:

Let assume the number be$x$.

Then, from the given statement we can write:

$=>2(\frac{5}{7} )+x=3\\\\=>\frac{10}{7} +x=3\\\\=>x=3-\frac{10}{7} \\\\=>x=\frac{3\times7-10}{7} \\\\=>x=\frac{21-10}{7} \\\\=>x=\frac{11}{7}$

Hence, if we add$\frac{11}{7}$ in$2$ times of$\frac{5}{7}$ we get$3$.