Original circumference = 2?r
New circumference = (150 /100) x 2 ?r
= 3?r
2?R = 3?r
? R = 3r/2
Original area = ?r2
New area = ?R2
= ?9r2 / 4 = 9?r2/4
Increase in area = (9?r2/4 ) - (?r2)
= (5/4) ?r2
Req. increase per cent = [{(5/4) ?r2} / {?r2}] x 100
= 125 %
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
Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong.
NA
Each previous number is multiplied by 2.
? 8 m shadow means original height = 12 m
? 1 m shadow means original height = 12/8 m
? 100 m shadow means original height = (12/8) x 100 m
= (6/4) x 100 = 6 x 25 = 150 m
Let 8% of 96 = y of 1/25
? (8 x 96)/100 = y/25
? y = (8 x 96 x 25)/100 = 192
Since the principal is not given, so data is inadequate.
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