Let original radius = r , original area = p *r2 New radius = 3r/4 m, New area = p (3r/4)2
= p *r2/16
Decrease in area = p* r2 - 9p r2/16
= 7 p r2/16
Decrease % =m 7 p* r2 * 1/ p r2* 100
= 43.75%
Q. No. :
2
Question :
If a square is formed by the diagonal of the square as an edge, what is the ratio between the area?
A :
2
B :
4
C :
1
D :
16
Answer: A
These questions are based on the situation given below:
Ten coins are distributed among four people P, Q, R, S such that one of them gets one coin, another gets two coins, the third gets three coins and the fourth gets four coins. It is known that Q gets more coins than P, and S gets fewer coins than R.
Q. No. :
3
Question :
If the number of coins distributed to Q is twice the number distributed to P then which one of the following is necessarily true?
A :
R gets an even number of coins.
B :
R gets an odd number of coins.
C :
S gets an even number of coins.
D :
S gets an odd number of coins.
Answer: D
Q. No. :
4
Question :
If R gets at least two more coins than S, then which one of the following is necessarily true?
A :
Q gets at least two more coins than S.
B :
Q gets more coins than P.
C :
P gets more coins than S.
D :
P and Q together get at least five coins.
Answer: B
Q. No. :
5
Question :
If Q gets fewer coins than R, then which one of the following is not necessarily true?
A :
P and Q together get at least four coins.
B :
Q and S together get at least four coins.
C :
R and S together get at least five coins.
D :
P and R together get at least five coins.
Answer: A
Q. No. :
6
Question :
In a class, the no. of boys is more than the no. of girls by 24 % of the total strength.The ratio of boys to girls is
Thickness of a rectangular box is P units. Its breadth is 4 more than the thickness and length 2 more than the breadth. What is the volume of the box.?