IBPS Government Jobs Exams Numerical Ability Area and Volume

The circumference of two circles is 88 metres and 220 metres respectively. What is the difference between the area of the larger circle and the smaller circle?
(1) 3422 sq.mtrs.
(2) 3242 sq.mtrs.
(3) 3244 sq.mtrs.
(4) 3424 sq.mtrs.
(5) None of these

Read Solution (Total 2)

2*pi*r1=88
r1=14.

2*pi*r2=220
r2=35

diff bw areas is = pir2^2-pir1^2

pi(r2^2-r1^2) [ a^2 - b^2 = (a+b)(a-b) ]
pi(49*21)=3234 sq.m
10 years agoHelpfull: Yes(5) No(0)

3244 the solution is same as Raju said
7 years agoHelpfull: Yes(0) No(0)

IBPS Other Question

he respective ratio between the present ages of Ram and Rakesh is 6 : 11. Four years ago the ratio of their ages was 1 : 2 respectively. What will be Rakesh's age after five years?
(1) 45 years
(2) 29 years
(3) 49 years
(4) Cannot be determined
(5) None of these Pradeep invested 20% more than Mohit. Mohit invested 10% less than Raghu. If the total sum of their investment is Rs. 17,880/-, how much amount did Raghu invest?
(1) Rs. 6,000/-
(2) Rs. 8,000/-
(3) Rs. 7,000/-
(4) Rs. 5,000/-
(5) None of these