5 + EN +

The Weekend Australian - Review - - Mind Games -

The av­er­age age of four broth­ers is 23. If the av­er­age age of the older three is 26, how old is the youngest? Each sym­bol rep­re­sents a dif­fer­ent digit from 1 to 9. The sum of the dig­its in each row and col­umn is shown. Can you work out which digit each sym­bol stands for? When you have re­placed each sym­bol in the square, find the sum of the num­bers along the di­ag­o­nal line that starts in the top left-hand cor­ner.

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