Others Maths Puzzle Numerical Ability

How many 4 digits number that is divisible by 5
can be formed using the digits 1,2,3,4,5,6,7 is?

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Others Other Question

A can do a piece of work in 100 days, B and C together can do the same work in 20 days. If B can do the work in same time as that of C and A together then how long C alone can do the same work? The ratio of two two-digit numbers, which have the same digits but in reverse order, is 7 : 4. What is the maximum possible difference between the two numbers?
a. 9 b. 18 c. 17 d. 36 e. 45