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The cost is: 15 times 2.22 = 33.3 because one key chain cost 2.22

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Q: If 7 key chains cost 15.54 then 15 key chains cost?
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If 5 key chains cost 11.25 then 15 key chains cost?

If 5 key chains cost 11.5 then one key chain costs 11.5 divided by 5, which is 2.3 so 15 key chains cost 2.3 x 15, which is 34.5Actually the cost of 5 chains is 11.25 not 11.50.so divide 11.25 by 5 to find the cost of one chain = 2.25now multiply 2.25 by 15 to find the cost of 15 chains = 33.75Another way to do it is to see that 15 chains is 3 times more than 5 so multiply the cost of 5 chains by 35x3 = 33.75


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