Question

A music store gives every 20th customer a $5 gift card. Every 50th customer gets a $10.00 gift card. Which customer will be the first to receive both types of gift cards?

Answer 1

100th customer is your answer

Find the first number that shows up on both answers when they are added

Add 20 each time for $5 gift card:

20, 40, 60, 80, 100

Add 50 each time for $10 gift card:

50, 100

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As seen above, the first number that shows up on both is 100, therefore, 100 is your answer

hope this helps