Ques:- Evaluate the sum of all even integers between 99 and 301?
Ques:- In a hostel there were 100 students. To accommodate 20 more students the average is decreased by rupees 5. But total expenditure increased by Rs.400. Find the total expenditure of the hostel now?
Recent Answer : :
Answer: 5400
Explanation:
100x + 400 = 12(x – 5)
x = 50
100 * 50 + 400 = 5400
Ques:- A light bulb is hanging in a room. Outside of the room there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit. If it is allowed to check in the room only once.How would you know which is the switch?
Recent Answer : :
Put switch 1 on and leave it on for 2 minutes, then switch it off.
Put switch 2 on and leave it on, then walk into the room.
If the light is on, the answer is switch 2.
If the light is off but the bulb is warm when you feel it, the answer is switch 1.
If the light is off and the bulb is cold when you feel it, the answer is switch 3.
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Ques:- Which of the folowing is not correct
a. (x+y)'=x'.y' b. (x'+y')'=x.y
c. (x'.y')'=x+y d. (x'+y')'=x'.y'
a. (x+y)'=x'.y' b. (x'+y')'=x.y
c. (x'.y')'=x+y d. (x'+y')'=x'.y'
Recent Answer : :
C
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Ques:- The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 8th number?
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Ques:- 30% apples out of 450 are rotten. How many apples are in good condition?
A. 180
B. 240
C. 315
D. 335
Recent Answer : :
450÷100×30=135
450-135=315
Ans: 315
Ques:- An equilateral triangle of side 3 inch is given. How many equilateral triangles of side 1 inch can be formed from it
Recent Answer : :
3×3=9
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Ques:- A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that at least one bulb is good?
Recent Answer : :
4/9
Ques:- Given a collection of points P in the plane , a 1-set is a point in P that can be separated from the rest by a line, .i.e the point lies on one side of the line while the others lie on the other side. The number of 1-sets of P is denoted by n1(P)….
Ques:- The C.I. on a certain sum for 2 years Rs.41 and the simple interest is Rs.40. What is the rate percent?
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Ques:- Given n people live in n houses and at some instant all of them disappear and reappear in some other house. What is the probability that no two meet each other.
Ques:- A person invested in all Rs. 2600 at 4%, 6% and 8% per annum simple interest. At the end of the year, he got the same interest in all the three cases. The money invested at 4% is?
Ques:- The difference b/w the compound interest payble half yearly and the simple interest on a certain sum lent out at 10% p.a for 1 year is Rs 25. What is the sum?(a) Rs. 15000(b) Rs. 12000(c) Rs. 10000(d) none of these
Recent Answer : :
A
Ques:- What is the sum of two consecutive even numbers, the difference of whose squares is 84?
Recent Answer : :
Let the numbers be x and x + 2.
Then, (x + 2)2 – x2 = 84
⇒ 4x + 4 = 84
⇒ 4x = 80
⇒ x = 20.
∴ The required sum
= x + (x + 2)
= 2x + 2
= 42
Ques:- At 6’o clock clock ticks 6 times. The time between first and last ticks was 30sec. How much time it takes at 12’o clock.
Recent Answer : :
66 seconds
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Ques:- Find the multiple of 11 in the following numbers.
A. 978626
B. 869756
C. 447355
D. 447355
Recent Answer : :
A. 978626
Summation of 301 – summation of 99
=41550
Summation of n=((n*n+1)/2)