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21/60 - 1/15 = 17/60
To subtract fractions, make them have the same denominator (bottom number) by converting them to equivalent fractions (usually with the lowest common multiple of the denominators) and then subtract the numerators (top numbers). So for 21/60 - 1/15:
lcm(15, 60) = 60:
21/60 = 21/60
1/15 = 4/60
⇒ 21/60 - 1/15 = 21/60 - 4/60
= 17/60
What else can I help you with?
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