Campus Maths Puzzle Numerical Ability LCM and HCF

Q. LCM of 3 nos is 120 which of the following no must not be their HCF
a. 8 , b.24 c.12 d.24 and 30

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Campus Other Question

A contractor decided to complete the work in 40 days & employed 60 men at the beginning & 40 men additionally after 10 days & got the work completed as per schedule. If he had not employed the additional men, how many extra days would he have needed to complete the work ? Area of a right-angled triangle is doubled while the base is reduced to its half. What % increase occurs in its height?