Solve the following riddle:I am a number, tell my identity! Take me seven times over and add a fifty, to reach a triple century you still need a forty.

To do:  Solve the riddle.

Solution:

Let the required number be $y$

$7y + 50 = 300 - 40 = 260$

$7y + 50 = 260$

$7y = 260 - 50 = 210$

$7y = 210$

$y = \frac{210}{7} = 30$

So, required number is 30.

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Updated on: 10-Oct-2022

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