book Maths Puzzle Numerical Ability

Tech high school surveyed its freshmen and found that 3/4 of the freshmen own an iPod. If 240 freshmen have iPods, how many freshmen attend Tech High?

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I dont understand why the 7 in the problem stays 7 in the answer.Why dont you multiply it by 7 making it 49? Please help me do this the cramer rule in math.

x + 3y z=-2
2x + 5y + z=-5
x + 2y +3z= 6