DIRECTIONS for the question:Solve the following question and mark the best possible option.
Children are arranged in a class room in Rows & Columns, so that no. of rows is 5 more than the number of columns. If the total of rows and columns is 25, find the number of children in the class.
A)
30
B)
25
C)
100
D)
125
E)
None of these
E
Let R be the no. of rows and C be the no. of columns, R = C + 5
Now R + C = 25 ⇒ C + 5 + C = 25 ⇒ 2C = 20 ⇒ C = 10 . Thus R = 10 + 5 = 15