Question

What number increased by 1/5 of itself equals 84?

Answer 1

So, the equation you need to set up is x+1/5x=84. Solve that. So that would be 6/5x=84, so 70 is the answer. You can check it too.

70+(1/5)*70= 84

Answer 2

Can someone answer my question here: http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e3967290b8bf47d065fb2bc

Answer 3

let the number be x
then \[x + \left( 1\div5 \right)x = 84\]
now LCM
\[\left( 5x + x \right)\div5 = 84\]
\[6x \div 5 = \]
\[6x = 84\times5\]
\[6x = 420\]
\[x = 420\div6\]
\[x = 70\]