The boy collected coins with value 5 CZK and 2 CZK when he had 50 pieces saved 190 CZK. How many he has each type of coin?

Correct result:

a =  30
b =  20


190 = 5a + 2b

190 = 5•a + 2•b

a+b = 50
5a+2b = 190

a = 30
b = 20

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