Oil Storage Cans Liters

We have to store seven cans of oil of 25 liters each in 45 cans, some of which are five liters and some three liters. How many three-liter cans and how many five-liter cans do we have?

Final Answer:

a =  25
b =  20

Step-by-step explanation:


a+b=45
3a+5b= 7·25

a+b=45
3·a+5·b= 7·25

a+b = 45
3a+5b = 175

Pivot: Row 1 ↔ Row 2
3a+5b = 175
a+b = 45

Row 2 - 1/3 · Row 1 → Row 2
3a+5b = 175
-0.67b = -13.33


b = -13.33333333/-0.66666667 = 20
a = 175-5b/3 = 175-5 · 20/3 = 25

a = 25
b = 20

Our linear equations calculator calculates it.



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