Chewing gums

You will pay 20 CZK less for three than seven chewing gums. How much is one chewing gum, and how much does a 5 pcs package cost?

Correct answer:

z =  5 Sk
b =  25 Sk

Step-by-step explanation:

3z + 20 = 7z

3·z + 20 = 7·z

4z = 20

z = 20/4 = 5

z = 5

Our simple equation calculator calculates it.
b=5 z=5 5=25 Sk

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