For this question you need to form two equation and do simultaneous equation. first you need to let A tickets to be x and B tickets to be y. the first equation is 10x+60y=6000 the second equation is x+y=500 use one of the equation and make the one expression the subject. so i choose equation two. x+y=500 x=500-y (equation 3) sub equation 3 into equation 1,
really all you have to do is subtract the exponents. 12^7-12^3=12^4, if you want to expand the numbers you can do it that way too. 12^7=35831808, 12^3=1728, 35831808/1728=20736 (which is the same as 12^4)
