Question

1
(Ans.)
to 850 per mon
10. fx is 30% more than y: find
11. The weight of a machine is 40 kg. By mistakes was weighed as 40-8 kg. Find the
12. From a cask, containing 450 tres of petrol, 8% of the petrol was lost by leakage and
evaporation. How many tres of petrol were left in the cask?
itx = 4, y = 5
у - 5 - 4
5
W = 4, y = 5
y - X
у - x
x
(Ans.)
() Again
by
error percent
12.5%
13. An alloy consists of 13 parts of copper, 7 parts of zinc and 5 parts of nickel. What is
the percentage of each metal in the alloy?
14. in an examination first division marks are 60%. A student secures 538 marks and
misses the first division by 2 marks. Find the total marks of the examination
15. Out of 1200 pupils in a school. 900 are boys and the rest are giris. I 20% of the boys
and 30% of the girls wear spectacles, sind:
how many pupils in all wear spectacles
w what percent of the total number of pupils wear spectacles
16. Out of 25 identical bulbs, 17 are red, 3 are black and the remaining are yellow. Find
the afference between the numbers of red and yellow bulbs and express this difference
17. A number first increases by 20% and then decreases by 20%. Find the percentage
increase or decrease on the whole.
18. A number is first decreased by 40% and then again decreased by 60%. Find the
percentage increase or decrease on the whole
19. 150% of a number is 750. find 60% of this number
as percent
original price
he new pro
hat is the old​

Answer 1

Answer:

its very large so a lot of time waste

Answer 2

Step-by-step explanation:

Here the question is that if 15% of a number has a value of 60 then what is that number that is we have to find 100%

Let the number be x

If 15 ———> 60

Then

100———> x

=> 15/100=60/x

=> x=400

A very easy way to find percentages is suppose if we take a number eg 50 and want 10% decrease one decimal i.e 5.0 and for 1% we should decrease 2 decimals i.e 0.5 and so on.If we if need to find 12% we can do it by just adding 10% and 2% i.e

12%=10%+2%=(5.0+2 (0.5))=6

In this way we find percentage of many number easily