# IGCSE Mathematics Paper-1: Specimen Questions with Answers 320 - 324 of 324

## Question number: 320

### Write in Short

Solve the simultaneous equations.

### Explanation

Here given the 2 equations

……………………. (1)

………………………. (2)

Equation 1 multiplied by 2

……………………. (3)

x value put in equation 1

## Question number: 321

### Write in Short

The price of an item changed from $150 to $130. Then later the price decreased again from $130 to $100. Which of the two decreases was larger in percentage term?

### Explanation

First decrease in percent

second decrease in percent

The second decreases was larger in percent term.

## Question number: 322

### Write in Short

Write as a column vector.

### Explanation

Here coordinates is

The coordinates of the vector are

## Question number: 323

### Write in Short

Write down the values of

, , , ,

### Explanation

Here given the

## Question number: 324

### Write in Short

Find the lowest common multiple of 3 and 7

### Explanation

Since the only number 3 and 7 go into evenly is 21.

A lowest common multiple is the smallest unit that both numbers can evenly be divided by.

Since you can evenly divide 21 by both 3 and 7 the following is true.

21 is the lowest common multiple of 3 and 7.