the number of real roots of the following equation are
x^8-8x^6 +24x^4-32x^2-65=0
a)0 b)2 c)4 d)6
Vijay Malla, a boatman, started crossing a river from point A on one shore of the river. He tried to row the boat straight to point B on the other shore, directly across the river from point A. But due to a current in the river, he ended up at point C, 250 metres from point A. He started his return journey from point C at (5/16)th of his earlier speed. Now, he ended up at point D on the first shore of the river, which is at a distance of 520 metres from point C. What is the width of the river? (Assume that the speed of the current was same throughout)
Ans : 200
Solution please.
Four men and two boys complete a task in 10 days. Two men complete the same task in 'n' days while five boys complete the same task in 'n - 5' days. What is the ratio of the number of days taken by an individual man to complete the task to the number of days taken by an individual boy to complete the task?
Solution Please.
Ans : 1:2
cost of erecting a fence round a square field of 625 hectares at 15 paise per metre is?
Oa: 1500
A number N when divided by 20 leaves a remainder of 11, while when divided by 21, it leaves a remainder of 13. What will be the remainder when N is divided by 15?
Find the no of zeros in the product of 1^1*2^2*3^3--------*49^49?
There are three classes X, Y and Z. The average age of the students of classes X and Y together is 20 years. The average age of the students of classes Y and Z together is 35 years. The average age of the students of classes X and Z together is 15 years. Which of the following can be the average age of all the three classes together? a 16 years b 38 years c 30 years d 25 years
Hey Puys! Needed some clarification on how do we round off our answer to 2 decimal places.. Suppose for the value 20.63451, is the answer 20.63 or is it 20.64?
The answer sheet of 5 engineering students can be checked by any one of the 9 professors. What is the probability that all the 5 answer sheets are checked by exactly by 2 professors ?
A student breaks the pencil in such a way that ratio of 2 broken parts is same as that of original length of pencil to one of the larger parts. The ratio of other part to original length is?
OA: 2:(3+rt5)
Approach please
If the roots of the equation x2 + 7x + 8 = 0 are in the ratio p : q (p > 0, q > 0), then the value of (p/q) ^ 1/2 +(q/p)^1/2 is
a)7 root(2)/4 b)-7 root(2)/4
c) 7/4 d)Cannot be determined
Suppose m is the smallest positive integer such that for any number n is greater than m. The quantity n^3+4n^2+n-4 is positive and p is the largest negative integer such that for any numeber n less than p the quantity n^3+4n^2+n-4 is negative. what is the value of m/p?
Rice of four kinds P, Q, R and S are available in a market with prices Rs. 24/kg, 25/kg, 27/kg, and 30/kg respectively. Mixture I contains rice of Kinds Q and R; Mixture II contains rice of kinds P and S; Mixture III contains rice of kinds Q and S. The three mixture are mixed to form mixture IV such that it has rice from mixtures I, II and III in the ratio 1: 2: 3. The entire quantity of mixture IV at Rs. 28/kg costs Rs. 16800. It is known that three of the kinds of rice were in equal quantities in mixture IV while the fourth kind was in a different quantity. What is the ratio of quantities of P and Q in mixtures II and III respectively?
Options:- 2 : 1
- 5 : 18
- 6 : 5
- 6 : 7
Can anybody explain this ?
The product of 10 natural numbers is 10!. Find the minimum possible value of the largest number out of the ten numbers.
general formula for number of terms in expansion?
Find the no. of 4 element subsets of {1,2,3.....20} such that the sum of 4 nos. is divisible by 4.
I'm getting pairs of 4k,4k+1,4k+2,4k+3 as(0000,1111,2222,3333,0022,0031,0112,0233,1322,1133). and OA as 1470 but OA given is 720.
There are two varieties of coffee - C1 and C2. The cost per kilogram of C1 is Rs.100 more than that of C2. C1 and C2 are mixed in the ratio 1 : 1 and the resulting mixture is sold at 36% profit. If C1 had been sold at that price, a profit of only 19% would have been made. Find the cost price of C1.
Options:
1. Rs.300 per kg
2. Rs.400 per kg
3. Rs.450 per kg
4. Rs.350 per kg
Approach ?
Archimedes was working on a problem. In the problem, there was a 3-digit number, N, with different non-zero digits X, Y and Z. Archimedes formed all possible 3-digit numbers using the digits of N, without repetition. The six number thus formed were divided into 3 groups - G1, G2 and G3 - with two numbers in each group. The sum of the numbers in G1, G2, and G3 were found to be 827, 980 and 1079 respectively. Which of the following cannot be a digit N?
a 6
b 2
c 3
d 4
I need detail method ..
There are 12 holes made in the ground. At least 3 are to be filled with a red ball and the other holes can be filled with any colour ball. In how many different ways can all the holes be filled from a box of 5 red balls and 10 mixed colour balls?
345
425 445 465 485
The sets Sx is defined as (x, x + 1, x + 2, x + 3, x + 4), where x = 1, 2, 3 . . . . . 50. How many of these sets contain a multiple of five or a multiple of seven but not both?OA is 15.Please share the approach:-)