Question

1(2) 100
(b) 400
(c) 900
(d) 500
% of a number is 40, then find the number.
3. The difference between increasing a number by 5% and decreasing it by
is the number?
4. A number is increased by 20% and then it is decreased by 10%. Find the net increase on
decrease per cent.
5. Vyas gets 20% less marks than that of Nidhi's marks. By what per cent Nidhi's marks is
more than Vyas's marks?
6. An alloy consists of 30% zinc, 45% nickel and the rest copper. Find the weight of copper
in 800 g of the alloy.
7. Find the weight of pure gold in 10 grams of 20 carat. It is given that 24 carat gold is
cent-percent pure gold.
8. A number is first increased by 10% and then it is decreased by 10%. Find the net increase
or decrease per cent.​

Answer 1

Answer:

let number be x

40%of x=100

x=100/40=50/20=

25/10