Looking for the lowest common denominator we find that 2 quarters equals 10 nickels. Therefore the ratio is 7 to 10 or 7/10.
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The easiest way is to convert everything to cents first. - Seven nickels = 35 cents - Two quarters = 50 cents - so 7 nickels to 2 quarters is the same as 35/50, or 0.7 as a decimal number.
A dollar is 100 cents, a quarter is 25 cents, and a nickel is 5 cents. Thus a dollar is composed of 4 (100/25) quarters, or 20 (100/5) nickels. Therefore there are 5 times as many nickels in a dollar as there are quarters. Another way to look at it is to say that there are 5 nickels in a quarter, so there are 5 times as many nickels as quarters in any amount.
It is 5:1.
2/5
18/7 is in its simplest form.