Question

Two thirds Of a number Is 3 1/2 ( three And a half) more than three eighths Of The number. Find The number.

Answer 1

The number is going to be 12. 
The equation of this question is going to be 
2x     7     3 x
3    = 2  + 8      Hope this helps!!

Answer 2

$\frac{2}{3}x - 3.5 = \frac{3}{8}x$
$\frac{2}{3}x - \frac{3}{8}x = 3.5$
$\frac{2}{3}x - \frac{3}{8}x = \frac{7}{24}x$
$\frac{7}{24}x = 3.5$

Multiply 3.5 by 24 and then divide by 7 and you get

x = 12