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Question
Add 2 to me. Then multiply by 5 and subtract 10 and divide new by 4 and I will give you 15! Who am I?
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Solution
According to the problem {[(I + 2) × 5] – 10} ÷ 4 = 15
{[(I + 2) × 5] – 10} = 15 × 4
= 60
I + 2 = `70/5`
= 14
(I + 2) × 5 = 60 + 10
= 70
I = 14 – 2, I = 12
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