Question

Amina thinks a number and subtracts $\dfrac{5}{2}$ from it. She multiplies the result with 8. The result now obtained is 3 times the same number she thought of what is the number.

Answer 1

Hint: Proceed the solution by assuming the number as any variable and apply the conditions given to get the answer.

Complete step-by-step answer:
Let us consider the number as x
 As per the condition given let us subtract $\dfrac{5}{2}$ from x then we get
$ \Rightarrow \left( {x - \dfrac{5}{2}} \right)$

Now on multiplying 8 to the resultant that we got then we get
$ \Rightarrow 8\left( {x - \dfrac{5}{2}} \right)$
Now it clearly mentioned that the above resultant is equal to 3time of same consider number
On applying the above condition to the resultant, then we get
$\
   \Rightarrow 8\left( {x - \dfrac{5}{2}} \right) = 3x \\
   \Rightarrow 8x - 20 = 3x \\
   \Rightarrow 5x = 20 \\
   \Rightarrow x = 4 \\
\ $
Therefore the number is 4.

Note: Make a note that we have to apply the condition to the considered number in the same order that they mentioned in the question. Following the proper order gives a proper result with simple calculation.