When all the students in a school are made to stand in rows of 46, 36 such rows are formed. If the students are made to stand in rows of 42, how many such rows will be formed ?	Choose the correct choice from the following:  A) 31  B) 36  C) 38  D) 39  E) 21
Explanation:   Total number of students = 46 x 36   When arranged in rows of 42, number of rows formed are,   = 39.   Answer: 39
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When all the students in a school are made to stand in rows of 46, 36 such rows are formed. If the students are made to stand in rows of 42, how many such rows will be formed ?