# IGCSE Mathematics Paper-1: Specimen Questions with Answers 23 - 25 of 175

## Question number: 23

### Write in Short

(a) Find the value of y when.

(b) Make “a” the subject of the formula.

### Explanation

Here, equation is where,

(a)

(b)

## Question number: 24

### Write in Brief

Hema reached at job at and left at . How long, in hours and minutes, did she spend at job?

### Explanation

Here, Hema reached at job at so from 9 to 12 means **3 hours**, from 08: 50 to 9: 00 means **10 minutes**, then another 6: 05 means **6 hours and 05 minutes**.

So, **she spends total of**

## Question number: 25

### Describe in Detail

John buys 25 books for. He sells all the books in the market for 75 cents each.

(a) Calculate the profit or loss he makes.

(b) Calculate the percentage profit or loss he makes on the cost price.

### Explanation

Here,

(a) He sells as 75 cent per 1 book.

As we know 1 euro = 100 cent

So, 15 euro =? cent

So,

So, John buys 25 books for 1500 cents (Cost price) and sells (Selling Price).

So, here he gains profit because selling price is more than cost price.

So,

(b) Percentage of profit of cost price (1500)