**Write variable expressions word problems :**

Here we are going to see some practice problems on variable expressions.

**Example 1 :**

Anaba has 10 more marbles than Susan. Write the variable expression to shoe the number of marbles that Anaba has.

**Solution :**

**Let Susan have "x" marbles. **

**Anaba has (x + 10) marbles**

**Example 2 :**

The length of a rectangular hall is 4 meters less than 3 times the width of the hall. What is the length, if the breadth is b meters?

**Solution :**

**Let "x" be the width of the hall**

**Then, **

**length of the hall = **4 meters less than 3 times the width of the hall

4 meters less means we have to subtract 4,

**So, length of the hall = 3x - 4**

**Example 3 :**

A rectangular box has height h cm. Its length is 5 times the height and width is 10 cm less than the length. Express the length and the width of the box in terms of the height.

**Solution :**

**"h" be the height of the rectangular box**

**length = **5 times the height ==> 5h

width = 10 cm less than the length. ==> 5h - 10

Hence length and width of the box are 5h and 5h - 10 respectively.

**Example 4 :**

The speed of a bus is 10 km/hour more than truck going on the same road.

**Solution :**

**Let "x km/hour" be the speed of the truck**

The speed of a bus = 10 km/hour more than truck

= 10 + x

Hence the speed of the bus is 10 + x.

**Example 5 :**

Price of oil per litre is 5 times the price of rice per kg.

**Solution :**

**Let "x " be price of rice per kg**

Price of oil = 5 times the price of rice per kg

= 5x

Hence the price of oil per kg is 5x.

**Example 6 :**

Price of wheat per kg is $5 less than the price of rice per kg.

**Solution :**

**Let "x " be price of rice per kg**

Price of wheat = $5 less than the price of rice per kg

= x - 5

Hence the price of wheat per kg is x - 5.

**Example 7 :**

How old will Susan be 5 years from now?

**Solution :**

**Let "x " be present age of Susan in years**

Five years from now Susan will be "x + 5" years old.

**Example 8 :**

How old was Susan 4 years ago?

**Solution :**

**Let "x " be present age of Susan in years**

Four years ago Susan was "x - 4" years old.

After having gone through the stuff given above, we hope that the students would have understood "Write variable expressions word problems".

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