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**Can you solve this problem as quickly as Einstein?**

#### Solution

We represent the orange with the letter ** n**, the banana with the

**, the cherries with the**

*p***and the melon with the**

*c***.**

*m*i) 4 x n = 28

ii) 2 x n + 2 x p = 30

iii) p + c + m + n = 20

iv) 2 m + c + p = 16

From i) we get that n = 7, from ii) that p = 8 and from iii) and iv) that m = 3 and c = 2.

Then **the sum of the unknown column is worth 25.**