It is 42.
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six
6/7 = 36/42.
1/6 + 1/7 needs to have common denominators to be successfully added. 6 and 7 are most common multiples of 42. We can achieve the common denominator by multiplying the fraction by the denominator of the other fraction. 1/6 (7) + 1/7 (6) = 7/42 + 6/42 = 13/42 which is the simplest form of the fraction.
To divide a fraction by a fraction you multiply the first fraction, or dividend (number being divided), by the reciprocal (reversed, numerator becomes denominator and denominator becomes numerator) of the divisor (number dividing the divisor). In this case, 6/7 would be multiplied by 7/36 and the answer would be 42/252, which can be reduced to 1/6. Hope this helps :)
7/10 is not an improper fraction as the numerator is smaller than the denominator. An improper fraction is a fraction where the numerator is larger than the denominator, such as 10/7.