Kilograms 69724

The hardware store sold 1 kg of nails for CZK 400 and 1 kg of screws for CZK 800. How many kilograms of nails and how many screws did they sell if they sold a total of 5 kilograms and earned CZK 3,200.

Correct answer:

a =  2 kg
b =  3 kg

Step-by-step explanation:

m=5 kg  a+b=m 400a+800b=3200 a+b=5 400a+800b=3200  a+b=5 400 a+800 b=3200  a+b=5 400a+800b=3200  Pivot:Row1Row2 400a+800b=3200 a+b=5  Row24001 Row1Row2 400a+800b=3200 b=3  b=13=3 a=4003200800b=4003200800 3=2=2 kg  a=2 b=3

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