What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30? · ABC26GN0536
Subject: General Aptitude · Chapter: H.C.F. and L.C.M. of Numbers
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
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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