Book Maths Puzzle

What is the least number which when divided by 8, 12, 15 and 20 leaves in each case a remainder of 5 ?

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Book Other Question

What is the LCM of 2/3, 5/6 and 4/9 ? Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ?