**Writing real world problems :**

To solve real world problems, we will write equations which represent the given situation.

In this section we are going to see, how we can write a real world problem when an equation is given.

This stuff will help the students to improve their creativity and have better understanding on real world problems and equations.

**Example 1 :**

Write a real-world problem for the equation 21.79 + x = 25.

**Solution :**

**Step 1 :**

Examine each part of the equation.

x is the unknown or quantity we are looking for.

21.79 is added to x.

" = 25 " means that after adding 21.79 and x, the result is 25.

**Step 2 :**

Write a real-world situation that involves adding two quantities.

Joshua wants to buy his mother flowers and a card for Mother’s Day. Joshua has $25 to spend and selects roses for $21.79.

How much can he spend on a card ?

Let x represent that amount.

**Step 3 :**

Solve the equation.

Joshua can spend $3.21 on a Mother’s Day card.

**Example 2 :**

Write a real-world problem for the equation x - 47 = 18

**Solution :**

**Step 1 :**

Examine each part of the equation.

x is the unknown or quantity we are looking for.

47 is subtracted from x.

" = 18 " means that after subtracting 47 from x, the result is 18.

**Step 2 :**

Write a real-world situation that involves adding two quantities.

Sarah used a gift card to buy $47 worth of food. She has $18 left on her gift card. Write an equation to represent this situation.

How much did she have in her card initially ?

Let x represent that amount.

**Step 3 :**

Solve the equation.

Sarah had $65 in her card initially.

**Example 3 :**

Write a real-world problem for the equation 2h = 8

**Solution :**

**Step 1 :**

Examine each part of the equation.

h is the unknown or quantity we are looking for.

h is multiplied by 2.

" = 8 " means that after having multiplied 2 and h, the result is 8.

**Step 2 :**

Write a real-world situation that involves adding two quantities.

Kim rented skates for h hours. The rental fee was $2 per hour. She paid a total of $8.

For how many hours did she rent skates ?

**Step 3 :**

Solve the equation 2h = 8.

Divide by "2" on both sides

2h/2 = 8/2

h = 4

Hence, Kim rented skates for 4 hours.

After having gone through the stuff given above, we hope that the students would have understood "Writing real world problems".

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