Cashier 82807

To pay out the amount of CZK 570, the cashier used 15 coins: a few fifty crowns and a few twenty crowns. How did she pay the amount?

Correct answer:

a =  9
b =  6

Step-by-step explanation:

570=50a+20b a+b=15  570=50 a+20 b a+b=15  50a+20b=570 a+b=15  Row2501 Row1Row2 50a+20b=570 0.6b=3.6  b=0.63.6=6 a=5057020b=5057020 6=9  a=9 b=6



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