Answer :

Let the number Amina thinks of be x.

According to question.
she subtracts 5/2 from it, then she multiplies the result by 8 and the result equals 3 times the original number

Multiplying inside the bracket, we get,

8x - 5/2 × 8 = 3x

8x - 5 × 4 = 3x

⇒ 8x - 20 = 3x

⇒ 8x - 3x = 20

⇒ 5x = 20

⇒ x = 4

Thus, the number is 4.

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