So, if 3 children got 50000, they got 3(50000) = 150000 total.
If he gave 1/6 away, the 150000 is 5/6 of what was left.
(5/6)x = 150000
x = 150000(6/5)
x = 180000
That 180000 is 9/10 of the money he started with.
(9/10)c = 180000
c = 180000(10/9)
c = 200000
He started with rs200000.