How many years is 1755 days

Four years and 294 days

One in five plus one in five plus one in five plus two in five is how many times how many

One in five plus one in five plus one in five plus two in five is one times one

15 of 21 × 3 of 4 + 10 of 21 × 3 of 4-3 of 4, simple and fast

(5/21)×(3/4)+(10/21)×(3/4)-(3/4)
=(3/4)×(15/21+10/21-1)
=(3/4)×[(15+10-21)/21]
=(3/4)×(4/21)
=1/7

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