Mother bought 21 desserts on the occasion of Mirka's birthday one tips was 9 CZK and the kremlin cost 12 CZK. For all desserts, she paid 213 CZK. How many kremlins and how many tips mums did buy?

Correct result:

k =  8
s =  13


k+s = 21
9s + 12k = 213

k+s = 21
9•s + 12•k = 213

k+s = 21
12k+9s = 213

k = 8
s = 13

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