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12 September, 11:18

Kelly joins Powerhouse Gym. The cost is $30 per month and a one-time $100 joining fee. Lisa joins MegaMuscle Gym for $35 per month and a $50 joining fee. In how many months will Lisa have paid more than Kelly?

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  1. 12 September, 11:42
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    L=50+35m, K=100+30m

    We want to know when L>K so

    50+35m>100+30m subtract 30m from both sides

    50+5m>100 subtract 50 from both sides

    5m>50 divide both sides by 5

    m>10

    So in 11 months Lisa will have paid more than Kelly.
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