a man sold 18 toys for rs . 18900 , gaining thereby the cost price of 3 toy find the cost price of a toy
"let the cost of one toy = x . then , cost of 18 toys = 18 x . gain = 3 x . sp of 18 toys = rs . 18900 . gain = sp â € “ cp 3 x = 18900 â € “ 18 x 21 x = 18900 x = rs . 900 . answer : option d"
divide(18900, add(18, 3))