Numbers - General Aptitude

Q1:

In a division sum, the remainder is 0. As student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient ?

A 0

B 12

C 13

D 20

ANS:D - 20

Number = (12 x 35) Correct Quotient = 420 ÷ 21 = 20