Question

Find the greatest 3 digit number which when divided by 75,
45 and 60 saves no remainder and the remainder sach
case
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Answer 1

You must mean "divided by 75, 45,AND 60." 

75 = 3×5² 

45 = 3²×5 

60 = 2²×3×5 

The number must be a multiple of 2²×3²×5² = 900. 

900 is the greatest 3-digit number that is divisible by 75, 45, and 60

hope it helps :)