Question 1190614
Assume Gopal had ${{{x}}} to begin with. 
First he spent {{{3/5}}} "of" his money. So that makes ${{{3x/5}}} in expenditure, and hence ${{{x-3x/5=2x/5}}} is what he is left with by the end of the first week.

Now the second week he spent {{{1/3}}}  "of" what he was left with. Since he was left with ${{{2x/5}}}, what he spent now would be ${{{1/3 * 2x/5}}} which is equal to ${{{2x/15}}}- his expenditure in the second week. 

The total expenditure of these two weeks would be the sum ofwhat he spent in these two weeks which is ${{{3x/5 + 2x/15}}} which is equal to ${{{(3*15+2*5)x/(5*15)}}} or ${{{11x/15}}}. This also means that now he's left with ${{{x-11x/15}}} or ${{{4x/15}}}. 

According to the problem, his total expenditure is $110. But we know that this number is instead ${{{11x/15}}}. That means ${{{x}}}, or the money that he had very initially, is ${{{15*110/11}}} which is ${{{150}}}. And as we found earlier the money that he is left with is ${{{4x/15}}} or ${{{4*150/15}}} or ${{{40}}}.