Aptitude · all questions

Problems On H.C.F And L.C.M
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Q141

The HCF and LCM of two numbers are 21 and 84 respectively. If the ratio of the two numbers is 1 : 4 then larger of the two numbers is = ?

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Q142

The LCM of two numbers is 12 times their HCF. The sum of the HCF and LCM is 403. If one of the number is 93, then the other is = ?

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Q143

The number of pairs of positive integers whose sum is 99 and HCF is 9 is = ?

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Q144

An electronic device makes a beep after every 60 sec. Another device makes a beep after every 62 sec. They beeped together at 10 am. The next time, when they would beep together at the earliest is = ?

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Q145

Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes , how many times do they toll together ?

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Q146

Four bells begin to toll together and toll respectively at intervals of 6, 7, 8 and 9 seconds. In 1.54 hours, how many times do they toll together and in what interval (seconds)?

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Q147

A number between 1000 and 2000 which when divided by 30, 36 and 80 gives a remainder 11 in each case is = ?

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Q148

The difference between the greatest and least prime numbers which are less then 100 is = ?

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Q149

The number between 4000 and 5000 that is divisible by each of 12, 18, 21 and 32 is = ?

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Q150

Three girls start jogging from the same point around a circular track and each one completes one round in 24 seconds, 36 seconds and 48 seconds respectively. After how much time will they meet at one point ?

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Q151

Three wheels can complete 40, 24 and 16 revolutions per minutes 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 ?

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Q152

Find the HCF of 132, 204 and 228 = ?

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Q153

The LCM of four consecutive numbers is 60. The sum of the first two numbers is equal to the fourth number. What is the sum of four numbers

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Q154

If the product of three consecutive numbers is 210, then the sum of the smaller numbers is = ?

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Q155

If three number are 2a, 5a and 7a, what will be their LCM ?

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Q156

The product of two whole numbers is 1500 and their HCF is 10. Find the LCM = ?

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Q157

A number x is divided by 7. When this number is divided by 8, 12 and 16. It leaves a remainder 3 in each case. The least value of x is = ?

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Q158

Two pipes of length 1.5 m and 1.2 m are to be cut into equal pieces without leaving any extra length of pipes. The greatest length of the pipe pieces of same size which can be cut from these two lengths will be = ?

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Q159

A general of an Army wants to create a formation of square from 36562 army men. After arrangement, he found some army men remainder unused.

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Q160

The number of pair of positive integers whose sum is 99 and HCF is 9 is =

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