In mathematics, usually when you see the word "of" it means to multiply. So multiply the two fractions together (top x top and bottom x bottom) and you get 21/20.
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The answer is 7/5, or seven fifths.
3/20
(7/4) x (17/5) = 119/20 = 5 and 19 twentieths.
3.5
It is: 7 and 3/4 = 7.75