Question

From a full barrel containing 729 litres of honey we
pour off 'a' litre and add water to fill up the barrel.
After stirring the solution thoroughly, we pour off 'a'
litre of the solution and again add water to fill up
the barrel. After the procedure is repeated 6 times,
the solution in the barrel contains 64 litres of honey.
Find a.
(a) 243 litres
(b) 81 litres
(c) 2.7 litres
(d) None of these
​

Answer 1

Answer:

d None of these

hope it helps

Answer 2

64/729=(729-a/729)^6

[2/3]^6=[729-a/729]^6

2/3=729-a/729

2*243=729-a

a=729-486

a=243