Question

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 1

a) 196 is not the answer aswhen doubled is not divisible by 2

b) 630 when doubled is divisible by 12, 18,21and 30

so it is the correct answer

so the answer is 630

hope it helps mark as brainliest

Answer 2

LCM of 12,18,21 and 30 is 1260

So required number is 1260/2 = 6307

hcf=7x5x3x3x2x2=1260

so the no is 1260/2=630

ans B