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3/5 of 30 is 90/5 
3/5 of 30  is 18 

so when it is 3/5 full then it has 18 gallons 

The gas tank contains 18 gallons when the gas tank is three-fifths full.

We are given that,

A gas tank can hold 30 gallons.

We need to find how many gallons it contains when it is three-fifths full.

What is a fraction?

A fraction has two parts :

- Numerator

- Denominator.

The numerator is the number of required parts from the total number of parts in the denominator.

We have,

"A gas tank can hold 30 gallons"

This means that when the gas tank is full it can hold 30 gallons.

We can write it as,

Full tank = 30 gallons ----------------(A)

Since we need to find three-fifths full, we need to multiply 3/5 in (A).

We have,

3/5 x full tank = 3/5 x 30 gallons

3/5 full tank = 3 x 6 gallons

3/5 full tank = 18 gallons.

Thus the gas tank can hold 18 gallons when the gas tank is three-fifths full.

Learn more about fraction word problems here:

https://brainly.com/question/1301963

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