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Puzzle #164: Can you untangle Amira’s maths homework?

Can you solve this week’s digit-swapping puzzle, Sum thing wrong? Plus the answer to puzzle #163

20 April 2022

Âé¶¹´«Ã½. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

 

#164 Sum thing wrong

Amira presented her homework to her teacher:

2 7 9 7

+ 2 3 6 7

= 4 6 5 4

Wrong, Amira, please check your working.

“I promise you it is right. It is just that I have used a code. Every digit used represents a different digit, and the same digit is always represented by the same ‘wrong’ digit. For example, maybe I replaced all the 6s with 4s. Or maybe I did something else…

“You are giving me a headache, Amira”.

What is the correct sum?

Solution next week

Quick quiz #148

1 A…

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