This presentation is the property of its rightful owner.
1 / 5

# Perplexing problems 1. PowerPoint PPT Presentation

Perplexing problems 1. What’s the number? It has 3 digits It is a multiple of 11 All the digits are odd The sum of its digits is a square number Answer: 979. Perplexing problems 2. How many go by bus? In a school of 1200 pupils, 580 are girls.

Perplexing problems 1.

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

## Perplexing problems 1.

What’s the number?

It has 3 digits

It is a multiple of 11

All the digits are odd

The sum of its digits is a square number

### Perplexing problems 2.

How many go by bus?

• In a school of 1200 pupils, 580 are girls.

• One third of the pupils travel to school by bus

• 462 boys do not go by bus

• How many girls do go by bus?

### Perplexing problems 3.

How many altogether?

• Sam and Ben collect marbles

• Sam tells Ben, “If you give me 5 marbles I’ll have twice as many as you.”

• Ben says, “If you give me 4 we would have the same number”.

• How many marbles were there altogether?

### Perplexing problems 4.

What number was the middle house?

• Five houses next door to each other were on the odd side of the road.

• They were all 2-digit numbers, and in ascending order

• The fourth one was the only prime number

• What number was the middle house?

### Perplexing problems 5.

How much altogether?

• Ann, Bob and Carol are counting their money

• Ann and Bob together have £5.98

• Bob and Carol together have £6.47

• Ann and Carol together have £8.51

• How much do they have altogether?