Let's shyam's share = x.................................................................(i)
Mohan's share = (x-25%x)=0.75x=y............................................(ii)
suresh's share =(y+25%y)=1.25y=1.25*0.75x=0.9375x=z........(iii)
x+y+z=516
x+0.75x+0.9375x=516.............put values from (i),(ii),(iii)
2.6875x=516
x=192
y=0.75*192=144
z=0.9375*192=180
192+144+180=516
Ans:shyam's share is Rs 192/-