book Maths Puzzle Numerical Ability

Using the letters A,M,O,S,U. We can form 120 five letter "words". If these "words" are arranged in alphabetical order, then what position the "word"
USAMO occupies?

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book Other Question

A druggist is perparing a medication. Each caspsule reqires 0.007 gram of aspirin. He has 14grams of aspirin. How many capsules can he prepare? My questions says write the equation of a line that has a slope of 2/3 and passes through point (6,-3)
my answer is y=4-7=-3
is that right?