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28 February, 17:39

A store is giving away a $10 dollar coupon to every 7th person to enter the store and a $25 coupon to every 18th person to enter the store. Which person will be the first to get both coupons?

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  1. 28 February, 19:59
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    A store is giving away a $10 dollar coupon to every 7th person to enter the store and a $25 coupon to every 18th person to enter the store.

    To find the first person to get both coupons, you have to find the LCM of 7 and 18. First list the multiples of each number.

    7 - 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133

    18 - 18, 36, 54, 72, 90, 108, 126, 144

    The common multiples are bold. The 126th person will be the first to get both coupons.
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