# IGCSE Mathematics Paper-1: Specimen Questions with Answers 177 - 180 of 324

## Question number: 177

Short Answer Question▾

### Write in Short

Multiply out the brackets .

### Explanation

Here given the

## Question number: 178

Short Answer Question▾

### Write in Short

There are 10 boys and 15 girls in a choir.

The probability that Carla arrives at school before 09: 00 is .

What is the probability that Carla does not arrive before 09: 00?

Write your answer as a fraction.

### Explanation

Here the given probability that Carla arrives at school before 09: 00 is

And find the probability that Carla does not arrive before 09: 00

## Question number: 179

Short Answer Question▾

### Write in Short

The figures below are similar. The labelled sides are corresponding. What is the perimeter of the large pentagons?

### Explanation

Find the ratio of the corresponding side lengths.

Find the ratio of the perimeters.

Use these two ratios to set up a proportion and solve for

The perimeter of the large pentagon is 50 cm.

## Question number: 180

Short Answer Question▾

### Write in Short

A website is selling packages of Helium confetti Balloons for Rs. 60, but mentions that they original cost Rs. 80. What is the discount percentage?

### Explanation

The percent of change formula can be used to find percent of discount.

Write the number as a percent.

The percentage of discount is 25%.