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

## Question 177

### Write in Short

Multiply out the brackets .

Here given the

## Question 178

### 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?

### 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

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.

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