Question

ram done 42 problems and 1/7 of the problem were mostake.how many problems he done correctly?

Answer 1

7 problems he did correctly...........

Answer 2

$total \: number \: of \: problems \\ = 42 \\ \: he \: has \: done \: mistake \: in \: \frac{1}{7} of \: 42 \\ = \frac{1}{7} \times 42 = 6$
hence No of correct
=Total- incorrect
42-6=36