# Chewing gums

For 3 chewing gums, you will pay 20 CZK less than 7 chewing gums. How much is 1 chewing gum and how much does a 5pcs package cost?

Correct result:

z =  5 Sk
b =  25 Sk

#### Solution:

3z + 20 = 7z

3•z + 20 = 7•z

4z = 20

z = 5

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