$1 = 100 cents
→ 90 cents/$2.70 = 90 cents/(2.70 × 100 cents) = 90 cents/270 cents = 90/270 = 1/3
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90 cents / 1 dollar = 90 cents/100 conets = 90/100 = 9/10
90 is one third of 270 so is 33.33% so in fraction form that is 33 1/3
90 x 3 = 270
A nickel is 5 cents so there are 20 in a dollar (100/5 = 20). Then $90 = 90*20 = 1800 coins.
90