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Daily Mail Mindbender July 19 21

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ginger1945 | 12:03 Sat 24th Jul 2021 | Quizzes & Puzzles
4 Answers
How mathematically prove answer 66
"One year ago Marjorie was half of her mother Belinda's age now.
In 15 years time they will both have ages that are square numbers.
How old is Belinda now?

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81 - 15 = 66

49 - 15 = 34

One year ago 33 = half 66
I think the OP reqiuires the mathematical formula not just the answer.
Question Author
Yes - formula
There is no 'formula'. The square numbers requirement gives a limited number of possibilities, and the fact that Belinda's age now is divisible by 2 eliminates about half of those. It's then just a matter of working through the remaining possibilities.

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