The cost of a pair of soccer boots and a T-shirt is $175. The cost of the T-shirt and a cap is $64. The cost of the pair of soccer boots is 4 times the cost of the cap. How much more does the pair of soccer boots cost than the T-shirt?
+105 Easy...
We can simplify this into:
a = soccer boots
b = T-shirt
c = cap
a+b = 175
b+c = 64
a = 4c
So we can substitute into:
4c + b = 175
c + b = 64
3c = 111
c = 37
b = 27
a = 148
So the soccer boots cost 148-27 = 121 more than the t-shirt.
(Please tell me if I did something wrong and the answer is incorrect) 
