PERCENTAGE
Exercise 9 (B)
1. EXPRESS:
i. Rs 5 as percentage of Rs 25 ii 80
paise as a percent of Rs 4
=Rs5/
Rs 25 x100%( / means divide) ( convert
Rs into paise)
=Rs 1
/Rs 5 x 100% ( Rs4
= 400p)
=20% 80 p
as percentage of 400p
=80p/400px100%
=1p/5px100%
=20%
iii. 700gm
as a percentage of 2.8 kg
hint
change 2.8kg into gm( 2800 gm)
2. Express
the first quantity as the percent of the second:
i. 40
p, Rs 2 ii.
500 gm, 6 kg
Rs 2=
200p 6kg=
6000gm
=40p/200px100%
=20%
3. Find the
value of each of the following
i. 20%
of Rs
150 ii
90 % of 130
=20/100x
Rs150
=RS
30
4.If man
spends 70 of his income what percent does he save?
Very
easy do it your self
5.A
girl gets 65 marks out of 80. What percent marks did she get?
=65/80x100%
=81.25%
6 .A
class contains 25 children out of which 6 are girls .What percentage of the
class are boys?
7. A
tin contains 20 lt. of petrol .Due to leakage 3 lt. is lost . What percent is
still present in the tin?
=17/20x100% (
3 lt is lost means 17lt is remaining)
=85%
8. An
alloy of copper and zinc contains 45% of copper and rest is zinc. Find the
weight of zinc in 20 kg of the alloy.
Given,
the percentage of copper=45%
Therefore,
the percentage of zinc=(100-45)%=55%
Since,
100 gm of alloy contains 55 gm of zinc
Hence,
20 gm of alloy contain 55/20x 100gm=11 gm(Ans.)
9. A
boy got 60 out of 80 in Hindi, 75 out of 100 in English and 65 out of 70
in Arithmetic.In which subject his percentage of marks is best. ?
I.HINDI
MARKS =
60/80X100% II.
ENG. MARKS= 75 /100X100%
=75% =75%
III.
ARTHI. MARKS= 65/70X100%
=93%
HIS
ARITHMETIC PERCENTAGE IS GOOD.
10. In
a camp, there were 500 soldiers. 60 more soldiers joined them. What percentage
of the earlier (original) number have
joined.
HINT (60/500X100%)
11.
In a plot of ground of area 6000 sq.m. only 4500 sq. m. is allowed for construction.
What percent is to be left without construction.
HINT REMAINING AREA=6000 – 4500
=1500sq. m
1500/600x100%
DEAR STUDENTS, SOLVE EXPECTED SUMS VERY SERIOUSLY
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