Question 508290
Let
Mr. Roy has = x
Mr. Pual has = x-4
Mr. Singh has = x-5

Together they have = 51
Mr. Roy + Mr. Pual +  Mr. Singh = 51
x+(x-4)+(x-5)=51
3x-9=51
3x=51+9
3x=60
divide by 3
3x/3=60/3
x=20


Mr. Roy has = x = 20
Mr. Pual has = x-4 = 20-4 = 16
Mr. Singh has = x-5 = 20-5= 15

20+16+15=51
51=51