Subject :IMO Class : Class 3
If 
× = 100, ÷ 2 = 
and + + + + = 100 ÷ 
, then find the value of .
A25
B10
C5
D4
Only 10*10 gives 100 so option B is only feasible solution. However, the answer is D that 4. Can anyone help on how to solve this?