Suppose your friend guessed **x**. And you told him to multiply **5** and then add **2** to it. So your friend got **5x + 2**. Suppose your friend got **17**. Now notice that if you do reverse operations on the number **17**, you will get what your friend guessed.

So what's the last operation you told him to do? You told him to add **2**. After adding **2**, your friend got **17**. So what was the number before adding **2**? simple **17 - 2 = 15**.

Now, how he got 15? By multiplying 5. Before multiplication, what was the number? Simple, **15/5 = 3**. So your friend guessed 3.

You can also solve this problem by solving equation like **Ax + B = what your friend got at last**. But the above approach is much more simpler.

86%
Solution Ratio

safayet08Earliest,

Coder_RafiFastest, 0.0s

wasimur_01Lightest, 0 B

touhidurrrShortest, 181B

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