Question

a student was asked to find 3/7th of a number and he instead multiply it by 7/3. as a result he got an answer which was more than the correct answer by 1680.what was the number

Answer 1

Answer:

720

Step-by-step explanation:

let the no he multiplied 7/3 with be x

7/3*x= 1680

x= 1680*3/7

x=720

hope you understood it

in the second step you divide it with 7/3 and during multiplication it reciprocates to become 3/7

THANK YOU.

Answer 2

Answer:

The requires number is 882.

Given problem:

A student was asked to find 3/7th of a number and he instead multiply it by 7/3. as a result he got an answer which was more than the correct answer by 1680.what was the number ?

Step-by-step explanation:

Let x be the required number

after multiplying x with 7/3 the resultant number number is 1680 more than by 3/7 of x

now convert the above sentence into mathematical expression

        $x(\frac{7}{3} ) = x ( \frac{3}{7} )+1680$  

        $x(\frac{7}{3} ) -x ( \frac{3}{7} )= 1680$  

          $\frac{7x}{3} - \frac{3x}{7} = 1680$    

           $\frac{49x- 9x }{21} = 1680$          

          40x = 35280  

               x = 35280/40 = 882