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Problems on LCM and HCF
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Three numbers are in the ratio 3:4:5 and their L.C.M is2400.
Their H.C.F is
80
40
200
120
Find the highest common factor of 36 and 84
4
6
12
18
The product of two numbers is4107.
If the H.C.F of these numbers is 37, then the greater number is
101
107
111
185
The greatest number which on dividing 1657 and 2037 leaves remainders 6 and 5 respectively, is
123
305
127
235
Find the greatest number that, while dividing 47, 215 and 365, gives the same remainder in each case
4
5
6
3
Find the greatest number which, while dividing 19, 83 and 67, gives a remainder of 3 in each case
18
19
16
17
Find the lowest 4-digit number which when divided by 3, 4 or 5 leaves a remainder of 2 in each case
1022
1030
1026
1020
Find the least number which when divided by 6, 7, 8, 9 and 10 leaves 1, 2, 3, 4 and 5 as remainders respectively, but when divided by 19 leaves no remainder
5016
5054
5073
5035
Find the least multiple of 13 which when divided by 6, 8 and 12 leaves 5, 7 and 11 as remainders respectively
143
169
221
260
A heap of stones can be made up into groups of 21. When made up into groups of 16, 20, 25 and 45 there are 3 stones left in eachcase.
How many stones at least can there be in the heap
3603
2403
7203
4803
Find the greatest number of four digits which when divided by 10, 15, 21 and 28 leaves 4, 9, 15 and 22 as remainders respectively
9654
9864
9664
9666
Find the least number which when divided by 35 leaves remainder 25, when divided by 25 leaves remainder 15 and when divided by 15 leaves remainder 5
515
435
518
420
There are four prime numbers written in ascending order ofmagnitude.
The product of the first three is 7429 and of the last three is12673.
Find the fourth number
23
29
31
17
A room is 4 meters 37 cm long and 3 meters 23cmbroad.
It is required to pave the floor with minimum squareslabs.
Find the number of slabs required for this purpose
391
381
485
431
A merchant has three different types of milk: 435 liters, 493 liters and 551liters.
Find the least number of casks of equal size required to store all the milk without mixing
61
51
47
45
In finding the HCF of two numbers, the last divisor was 41 and the successive quotients, starting from the first, where 2, 4 and 2. The numbers are
820,360
800,500
700,400
820,369
Least perfect square number, exactly divisible by 21, 36 and 56 is
3600
7056
441
504
The least number of five digits that have 144 their HCF is
10075
10070
10085
10080
The least number of four digits which is divisible by 4, 6, 8 and 10 is
1095
1080
1085
1075
Find the H.C.F of 12, 16, 18 and 24
3
2
4
1
1
2
3
5
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