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

## Question 177

### Write in Short

Short Answer▾

Multiply out the brackets .

Here given the

## Question 178

### Write in Short

Short Answer▾

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 179

### Write in Short

Short Answer▾

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

### 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 180

Edit

### Write in Short

Short Answer▾

A website is selling packages of Helium confetti Balloons for ₹ 60, but mentions that they original cost ₹ 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 % .