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Ans 1:
Class : Class 10
This equation is formed like that:
Let present age =x
Twenty years ago=x-20
A.T.C
x-20 = 1/3 ×x
-20 =1/3x-x
-20 = -2/3x
20÷2/3 =30 years
Age after 15 years =30+15 =45 years
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Ans 1:
Class : Class 7
according to me, the ans should be 3 litres. as 1.5 L * 3 = 4.5 L which is the amount used in 3 days(Tue, Wed n Thurs) hence, 7.5 L- 4.5 L=3 LITRES.That, according to me, is the answer
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Ans 1:
Class : Class 9
d = 75% of old d .....
=> r = 75 %of old r.....
volume of sphere =4/3 *pi*r*r*r......
new= 4/3*pi*r*r*r*27/64.....
4/3*pi*r*r*r will cancel out.....
volume(new) =27/64 of old, decreased by 37/64, % =37/64*100=3700/64=37*25/16 = 57.81....
therefore answer is opt (D) .....hope you understood!!!!!