ABC26GN0536 · H.C.F. and L.C.M. of Numbers

Subject: General Aptitude · Chapter: H.C.F. and L.C.M. of Numbers · Exam: · Marks: · Difficulty:

What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30?
(a)196
(b)630
(c)1260
(d)2520
Answer
Answer (as printed): B
Explanation
L.C.M. of 12, 18, 21, 30 $$\begin{aligned} & =2 \times 3 \times 2 \times 3 \times 7 \times 5 \\ & =1260 . \end{aligned} \therefore \quad \text { Required number }=(1260 \div 2)=630 .$$

Explanation as extracted from the printed page; notation may be imperfect.

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