By selling a watch for Rs 1505 , a man gains 1 by 6 of its cost price. Find the cost price of the watch. Share with your friends Share 0 Manbar Singh answered this Let the CP of the watch = Rs xNow, SP of the watch = Rs 1505Gain = SP - CP⇒CP6 = SP - CP⇒CP6 + CP = SP⇒CP + 6 CP6 = SP⇒7CP6 = SP⇒7x6 = 1505⇒x = 1505 × 67 = 1290So, CP of the watch = Rs 1290 1 View Full Answer