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. Find the largest 4-digit number which when divided by 16, 20, 25 and 48, leaves the same remainder 15 in each case.
2. If LCM of two variables is p2q3, then which of the following could not be its HCF?
3. A daily wage laborer was engaged for a certain number of days for Rs.5950, but being absent on some of those days he was paid only Rs.4900. What is the maximum possible daily wage?
4. If X, Y and Z are three numbers, such that LCM of X and Y is X and LCM of Y and Z is Y, then find the HCF of X, Y and Z.
5. What is the GCD of 1.14, 0.38 and 0.95?
6. Find the HCF of x2-y2, x6-y6 and x10+y10.
7. 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.
8. The sum and difference of two numbers is 128 and 64 respectively. Find the HCF.
9. What is the value of k for which the HCF of x2+kx+6 and x2+x-2 is (x+2)?
10. Two numbers are in the ratio 15:16. If the HCF is 8, find the numbers.
11. Two numbers are in the ratio 4:5. Their LCM is 240. Find the sum of numbers.
12. If P, Q and R are three numbers, such that HCF of P and Q is P and HCF of P and R is R, then find the LCM of P, Q and R.
13. Find the smallest number when decreased by 20 is divisible by 40, 50 and 70.
14. Find the least number which when divided by 8, 9, 12 and 15 leaves the same remainder 5 in each case.
15. Which of the following number should be added to 1200 in order to make derived number divisible by each of 12, 26 and 27?
16. Find the reduced form of \(\frac{174}{377}\).
17. 27 apple trees, 54 orange trees and 72 mango trees are to be planted in rows such that each row has contains the same number of trees of one variety only. Find the minimum number of rows in which the trees may be planted.
18. LCM of two prime numbers m and n (m>n) is 203. Then what is the value of 4y-x?
19. Find the smallest 5-digit number which is divisible by 36, 75 and 108.
20. Find the HCF of 48x5y7z3, 18x6y4z5 and 54x7y2z7.
21. What is the value of k, if HCF of x2-x-2 and 2x2-kx-4 is (x-k)?
22. Three runners running around a circular track can complete one revolution in 8, 12 and 18 minutes respectively. After how many minutes will they meet at the starting point?
23. Find the greatest number that divides 2069, 3121, 4409 and 5711.
24. A pendulum strikes 6 times in 3 seconds and 7 times in 5 seconds. If both pendulums start striking at the same time, how many clear strikes can be listened in 2 minutes?
25. A school has 504 girl students and 1176 boy students. The school is divided into strictly boys or strictly girls’ section. All sections in the school have same number of students. Given this information, what are the minimum number of sections in the school?