alleryWhat is the reciprocal of 3/7?
A3/7
B1/21
C-3/7
D7/3
Answer & Solution
Correct answer: D. 7/3
1. The reciprocal swaps the numerator and the denominator.
2. Swapping 3 and 7 in 3/7 gives 7/3.
3. Check: 3/7 x 7/3 = 1, while the other options do not give 1.
_Source: Wikipedia, Fraction, section Reciprocals and the invisible denominator_
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