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18-04-2017
Mathematics

contestada

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?

Respuesta :

18-04-2017

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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