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Quantitative Aptitude Practice Test: HCF & LCM
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HCF stands for Highest Common Factor and LCM stands for Lowest Common Multiple. The HCF is the largest integer that can be divided by two or more numbers. The LCM is the smallest integer that is a multiple of two or more composite numbers. You can calculate the HCF and LCM of two or more numbers by writing out a list of factors or multiples. However, this can be time consuming and complicated when dealing with large numbers. You can also use prime factors to calculate the HCF and LCM. The HCF of a set of numbers is the product of the prime factors that are common to all of the numbers. For... Show more
Quantitative Aptitude Practice Test: HCF & LCM
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25 Questions

1. If (z-2) is the HCF of (z2-4) and pz2-q(z-3), then which of the following is true?
2. Find the number of pairs whose sum is 88 and HCF is 8.
3. Find the largest 4-digit number which when divided by 16, 20, 25 and 48, leaves the same remainder 15 in each case.
4. Find the HCF of 48x5y7z3, 18x6y4z5 and 54x7y2z7.
5. Two numbers are in the ratio 4:5. Their LCM is 240. Find the sum of numbers.
6. The capacity of two pots is 130 and 78 liters respectively. Find the maximum possible capacity of a container which can exactly measure the contents of 2 pots.
7. Find the least number which is divisible by 22, 24, 38, 55, 72 and 76.
8. The traffic signals at three different road crossings change after every 30, 45, 50 and 100 seconds respectively. If they all change simultaneously at 11:50 am, then at what time will they again change simultaneously?
9. For integers x, y and z, LCM(x,y) is x and LCM(y,z) is y, then find the LCM(x,y,z).
10. Find the third term in the series of common multiple of 27, 81 and 135.
11. Find the HCF of 16(x5+x4-6x3) and 40(x4+4x3+3x2).
12. The HCF of two numbers, each having 3-digits is 19 and their LCM is 1197. Find the sum of the numbers.
13. Find the LCM of 35*57*72, 35*55*7*11, 36*53*13 and 37*52*11*13.
14. Three wheels can complete 25, 21 and 16 revolutions per minute respectively. There is a red spot on each wheel that touches the ground at time zero. After how much time, all these spots will simultaneously touch the ground again?
15. The sum of two numbers is 552 and their HCF is 23. What is the minimum number of pairs that satisfy these conditions?
16. Find the HCF of \(\frac{65}{3},\frac{91}{12},\frac{143}{20} and \frac{195}{26}\).
17. LCM of two prime numbers m and n (m>n) is 203. Then what is the value of 4y-x?
18. The sum and difference of LCM and HCF is 3175 and 3125 respectively. If the sum of the numbers is 575. Find the numbers.
19. The HCF and LCM of two numbers are 33 and 4719 respectively. When the first number is divided by 3, the quotient is 121, find the other number.
20. The sum and difference of two expressions are 2x2+6x+4 and 4x+8. Find the HCF.
21. If x and y are two distinct positive integers, then find the HCF of \(\Big(\frac{x}{HCF(x,y)},\frac{y}{HCF(x,y)}\Big)\).
22. Find the least number which when divided by 18, 25, 30 and 54 leaves remainder 15, 22, 27 and 51 respectively.
23. The HCF of two numbers is 27. Which of the following cannot be its LCM?
24. What is the value of k for which the HCF of x2+kx+6 and x2+x-2 is (x+2)?
25. Find the HCF of polynomials (x+1)2(x-2)(x+3) and (x+1)(x+2)(x+3)2.