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.



Did you find an error or inaccuracy? Feel free to send us. Thank you!







Tips for related online calculators
Do you have a system of equations and are looking for calculator system of linear equations?
Tip: Our volume units converter will help you convert volume units.

You need to know the following knowledge to solve this word math problem:

algebrabasic operations and conceptsUnits of physical quantitiesGrade of the word problem

Related math problems and questions: