Question

Amina thinks of a number and subtract 5/2 from it .She multiplirs the result by 8 . The final result is 3 times the original number .Find the number

Answer 1

Let the number be X.
Now subtract 5/2 from X and then multiply by 8.
Therefore, (X - 5/2)×8 is 3 times of X.
Now,
$(x - \frac{5}{2} ) \times 8 =3x$
$( \frac{2x - 5}{2} ) \times 8 = 3x$
$(2x - 5) \times 4 = 3x$
$8x - 20 = 3x$
$5x = 20$

$x = 4$