The average of the test scores of a class of $'m'$ students is $70$ and that of $'n'$ students is $91.$ When the scores of both the classes are combined, the average is $80 .$ What is $n / m$ ?
The average of the test scores of a class of $'m'$ students is $70$ and that of $'n'$ students is $91.$ When the scores of both the classes are combined, the average is $80 .$ What is $n / m$ ?
- A
$\frac{11}{10}$
- B
$\frac{13}{10}$
- C
$\frac{10}{13}$
- D
$\frac{10}{11}$
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