model 3 find hcf of numbers Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 5 EXERCISES
The following question based on LCM & HCF topic of quantitative aptitude
(a) 17
(b) 19
(c) 23
(d) 44
The correct answers to the above question in:
Answer: (a)
First of all we find HCF of 391 and 323.
∴ Number of classes = 17
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Read more find hcf using formula Based Quantitative Aptitude Questions and Answers
Question : 1
The greatest number, by which 1657 and 2037 are divided to give remainders 6 and 5 respectively, is
a) 305
b) 133
c) 127
d) 235
Answer »Answer: (c)
Using Rule 7,
(The largest number which when divide the numbers a, b and c give remainders as p, q, r respectively is given by H.C.F. of (a – p), (b – q) and (c – r).)
We have to find HCF of
(1657 – 6 = 1651) and (2037 – 5 = 2032)
1651 = 13 × 127
2032 = 16 × 127
∴ HCF = 127
So, required number will be 127.
Question : 2
What is the least number of square tiles required to pave the floor of a room 15 m 17 cm long and 9 m 2 cm broad?
a) 814
b) 841
c) 840
d) 820
Answer »Answer: (a)
Length of the floor
= 15 m 17 cm = 1517 cm
Breadth of the floor
= 9m 2 cm = 902 cm.
Area of the floor
= 1517 × 902 $cm^2$
The number of square tiles will be least, when the size of each tile is maximum.
∴ Size of each tile = HCF of 1517 and 902 = 41
∴ Required number of tiles
=${1517× 902}/{41× 41}$ = 814
Question : 3
The greatest number by which 2300 and 3500 are divided leaving the remainders of 32 and 56 respectively, is
a) 84
b) 168
c) 136
d) 42
Answer »Answer: (a)
Using Rule 7,
(The largest number which when divide the numbers a, b and c give remainders as p, q, r respectively is given by H.C.F. of (a – p), (b – q) and (c – r). )
Required number
= HCF of 2300 – 32
= 2268 and 3500 – 56 = 3444
∴ HCF = 84
Question : 4
A milk vendor has 21 litres of cow milk, 42 litres of toned milk and 63 litres of double toned milk. If he wants to pack them in cans so that each can contains same litres of milk and does not want to mix any two kinds of milk in a can, then the least number of cans required is
a) 12
b) 6
c) 3
d) 9
Answer »Answer: (b)
Maximum quantity in each can
= HCF of 21, 42 and 63 litres
= 21 litres
Required least number of cans
= $21/21 + 42/ 21 + 63/21$
= 1 + 2 + 3 = 6
Question : 5
There are 24 peaches, 36 apricots and 60 bananas and they have to be arranged in several rows in such a way that every row contains the same number of fruits of only one type. What is the minimum number of rows required for this to happen ?
a) 6
b) 9
c) 12
d) 10
Answer »Answer: (d)
Minimum number of rows = Maximum number of fruits in each row
∴ HCF of 24, 36 and 60 = 12
∴ Minimum number of rows
= $24/12 + 36/12 + 60/12$
= 2 + 3 + 5 = 10
Question : 6
Let N be the greatest number that will divide 1305, 4665 and 6905 leaving the same remainder in each case. Then, sum of the digits in N is :
a) 8
b) 5
c) 4
d) 6
Answer »Answer: (c)
Using Rule 7,
The greatest number N = HCF of (1305 – x ), (4665 – x ) and (6905 – x),
where x is the remainder
= HCF of (4665 – 1305), (6905– 4665) and (6905 – 1305)
= HCF of 3360, 2240 and 5600
∴ N = 1120
Sum of digits = 1 + 1 + 2 + 0 = 4
LCM & HCF Shortcuts and Techniques with Examples
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model 1 Basic formula of LCM & HCF
Defination & Shortcuts … -
model 2 find lcm of numbers
Defination & Shortcuts … -
model 3 find hcf of numbers
Defination & Shortcuts … -
model 4 addition, subtraction, multiplication and division with lcm & hcf
Defination & Shortcuts … -
model 5 lcm & hcf vs ratios
Defination & Shortcuts …
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