Exam Maths Puzzle Numerical Ability LCM and HCF

lcm of 0.72,1.2,2.24

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Exam Other Question

difference between lcm and hcf is 668 and sum of lcm and hcf is 676 one number is 32 another number is? reducing the 10% cost of pens , ramu got 9 more pens extra for 545 rupees.
Find out the cost of each pen?