Question

What value of * makes the following correct -

Answer 1

Checking that 3 works:
3 3 3 3
- - - + - = -
3 2 4 12

1 - 1.5 + 0.75 = 0.25

          0.25 = 0.25, which confirms that 3 is correct.

To deduce the answer directly from the question, we can multiply throughout by 12,

*     *     *     *
-  -  -  +  -  =  -
*     2     4     12

to give:

12 - 6* + 3* = 1*

    12 - 3* = 1*

         12 = 4*

          3 = *

As required.

Answer 2

if *=3 then condition will be
3/3-3/2+3/4
1-3/4

"1/4" L.H.S
and
3/12
"1/4" R.H.S