Perplexing problems 1
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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 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.

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Perplexing problems 1

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

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?

    Answer: 242


Perplexing problems 3

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?

    Answer: 54


Perplexing problems 4

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?

    Answer: 95


Perplexing problems 5

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?

    Answer: £10.48


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