Two boys begin together to write out a booklet containing 817 lines. The first boy start with first line, writing at rate of 200 lines an hour and the second boys start with a last line. He writes line 817 and so on backwards proceeding at the rate of 150 lines an hour. An what line will they meet?

4th observation i.e., 8 is the median.

47/10000 = .0047

.02 =(2/100) x 100% =2%

Let N / 11 = 233
Then, N = 233 x 11 = 2563
? Missing digit is 5.

121012 = 12 x 10084 + 4
? remainder = 4

We have the important relation, More work, More time (days)
? A piece of work can be done in 6 days.
? Three times of work of same type can be done in 6 x 3
= 18 days

? = 750.0003 ÷ 19.999
? ? ? 750 ÷ 20
? ? ? 375 ? 38