The team bought white t-shirts for CZK 100/piece and black t-shirts for CZK 80/piece. A total of 50 pieces for 4200 CZK. How many black and white T-shirts did they buy?

Correct answer:

a =  10
b =  40

Step-by-step explanation:

100a+80b=4200 a+b=50  100 a+80 b=4200 a+b=50  100a+80b=4200 a+b=50  Row21001 Row1Row2 100a+80b=4200 0.2b=8  b=0.28=40 a=100420080b=100420080 40=10  a=10 b=40

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