Salim and Asma are going to a fair to enjoy themselves. Their parents give Rs 49 and Rs 45 respectively as spending money. At the end of the day they have spent equal amounts, but one of them has 3 times as much money left as the other. How much money has each spent?

First, let's make a variable to represent the total amount of money each spent.

How about 'r'?

Since they both spent the same amount of money, you can represent the money they have left with these two equations:

49 - r

45 - r

Because one has 3 times more than the other, it can be represented like this:

49 - r = 3 (45 - r)

49 - r = 135 - 3r

Subtract 49 from both sides:

-r = 86 - 3r

Add 3r to both sides:

2r = 86

r = 43

They've both spent Rs 43

Good luck!