Q1.If a% of b = b % of c , then how many of the following statements are necessarily correct? Q2.Fresh X contains 20% water by weight and dry X contains 10% water by weight. What quantity of dry X (in kg) can be formed from 9kg of fresh X? Q3.If the radius of a circle is increased by 50%, then what is the percentage increase in its area? Q4.In a class 60% of the students donated Rs. 800 each and hence contributed 75% of the total donations. What is the average donation of the remaining students? |
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Q3.If the radius of a circle is increased by 50%, then what is the percentage increase in its area?
a. 225% b. 200% c. 125% d. 100%
increase percentage=(2.25pi-pi)/pi=125%
Little Star
n/a
Q4.In a class 60% of the students donated Rs. 800 each and hence contributed 75% of the total donations. What is the average donation of the remaining students?
a. Rs. 400 b. Rs. 500 c. Rs. 600 d. Rs. 300
if total donation=y
so from data, 0.6*800=y*0.75
so y=640
now average donation of 40% student is x, 0.60*800+.40*x=640 so x=400
Little Star
n/a
Q2.Fresh X contains 20% water by weight and dry X contains 10% water by weight. What quantity of dry X (in kg) can be formed from 9kg of fresh X?
a. 6.4 b. 5 c. 8 d. 7.2
dry in freshX =.80*9=7.2
dry in dry X=.9*7.2=6.4
Here Confsion we have to find dryportion of dry x or only Dry x
Little Star
n/a
Q1.If a% of b = b % of c , then how many of the following statements are necessarily correct?
I. b = 0 II. a = c III. Either b = 0 and or c = a
a. I
b. II
c. All three
d. None of these
from data,(ab/100)=(bc/100)
i think III option is right so ans option is (d)
little star
n/a
9 kg of fresh x ‘ll contain – 9 x 0.8a = 7.2a value of x
And with 7.2a value of x we can make 7.2a/.9 = 8kg of fresh x
Q4.In a class 60% of the students donated Rs. 800 each and hence contributed 75% of the total donations. What is the average donation of the remaining students?
a. Rs. 400 b. Rs. 500 c. Rs. 600 d. Rs. 300
let us assume no of students as 100.
nw 60 students donated 800 each
donation by 60 students=48000(60*800)
total donation by 100 students=48000*(4/3)=64000
donations by 40 student=(64000-48000)=16000
so average donation by remaining students=(16000)/40=400
regards
amitakshay
Q3.If the radius of a circle is increased by 50%, then what is the percentage increase in its area?
a. 225% b. 200% c. 125% d. 100%
let radius =r
so new radius=1.5r
so area=(pi)(1.5r^2)=2.25(pi)(r^2)
so % increase=(1.25(pi)(r^2)/(pi)(r^2))*100=125%
I think the asnwer is a=c.
Let a=10, b=20
then 20*10/100=2
According to the question a% of b=b% of c.
Therefore, a%of b =2
so, 2 = 20/100*c
2 = 1/5*c
2*5 = c
c = 10 = a
a= c
answer of q.1 is defintely 2nd option i.e. II.
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