Let h be the height,
Volume of the cone = V
and curved surface area of the cone = c
? 1/3 ?r2h = V, ?rl = c
i.e., ?r?r2 + h2 = c
?2r2(r2 + h2) = c2
Consider 3?Vh3 - c2h2 + 9V2
= 3? x 1/3?r2h x h3 - ?2r2(r2 + h2)h + 9 x 1/9 x ?2r4 h2
= ?2r2h4 - ?2r4h2 - ?2r2h4 + ?2r4 = 0
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
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