# IGCSE Mathematics Paper-1: Specimen Questions with Answers 25 - 26 of 324

## Question 25

### Describe in Detail

Essay▾

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 1,500 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 (1,500)

## Question 26

### Write in Short

Look at the sequence of numbers

(a) Write down the next number in the sequence.

(b) Find the 10th number in the sequence.

(c) Write an expression, in terms of n, for the nth number in the sequence.

### Explanation

Here, sequence is

(a) Here, these numbers are odd numbers and also this sequence is having the numbers like:

So, here bold numbers are not in sequence, so after 19 there will be 23.

(b) Here, further sequence is like:

So, 43 will be the 10th number in the series.

(c) Expression in terms of n of sequence where .

• So, first term will get by:
• Second term will get by:
• Third term will get by: and so on.