Perplexing problems 1.

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# 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.

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### 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?