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-8
Any multiple of 24 has 2, 3 and 8 as factors which are all positive single-digit integers.
A two-digit number that is a multiple of 3 and 7 and 1 less than a multiple of 5 is 84, because 84/7=12 and 84/3=28 and 84 is 1 less than 85, and 85 is a multiple of 5 so the answer is 84
12
Double the last digit. Subtract it from the rest. If the result is divisible by 7, the original number is divisible by 7.