# IGCSE Mathematics Paper-1: Specimen Questions with Answers 169 - 170 of 324

## Question 169

### Write in Short

Oil is sold in two sizes, 500 ml and 1 liter.

A contains 500ml and costs \$ 1.50. B contains 1 liter and costs \$ 2.60. Which is the better value for money?

### Explanation

Here,

Bottle A contains 500 ml for 1.50 dollars and B contains 1 liter and costs \$ 2.60.

So, for comparison of both bottles we need to convert liter into ml.

Now, for B: 1 liter (1000 ml) = 2.60 dollars

So, Money for 500 ml = ? dollars

Thus, money for 500 ml for A = 1.50 dollars and money for 500 ml for B = 1.3 dollars which is less than A.

So, better value is of B which is 1 liter and costs \$ 2.60.

## Question 170

### Write in Short

for the shape shown,

Write down

(a) The number of lines of symmetry,

(b) The order of rotational symmetry

### Explanation

Here,

(a) If we can reflect a figure over a line and the figure appears unaffected, then the figure has reflection symmetry or line symmetry.

• The line that you reflect over is called the line of symmetry.
• A line of symmetry divides a figure into two mirror-image separations.
• The number of lines of symmetry of a square is 4 because it has four equal sides by reflecting all we can get same image as it is.

(b) The order of rotational symmetry of square is also 4 because when we rotate it, it will see in same position as shown in given figure for four times.