Book Maths Puzzle

The ratio of two numbers is 4 : 5. If the HCF of these numbers is 6, what is their LCM?

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Book Other Question

What is the HCF of 2.04, 0.24 and 0.8 ? A boy divided the numbers 7654, 8506 and 9997 by a certain largest number and he gets same remainder in each case. What is the common remainder?