Question 577775
the age of a crocodile 13 years ago was 1/3 of its age 7 years from now.
 How old is the crocodile at present?
:
The equation for this:
x - 13 = {{{1/3}}}(x+7)
multiply both sides by 3
3(x-13) = x + 7
3x - 39 = x + 7
3x - x = 7 + 39
2x = 46
x = 46/2
x = 23 yrs is the present age