 
 <translate> If Mary weighs 160 lbs, Jamison weighs 160 lbs + 20 lbs = 180 lbs. If John weighs one - quarter less than what Mary weighs, he weighs 1 / 4 * 160 lbs = 40 lbs more. The total weight of John is 160 lbs + 40 lbs = 200 lbs. The total weight for the three is 200 lbs + 180 lbs + 160 lbs = 540 lbs.
Therefore, the answer is 540. <hau> Idan Mary na da nauyin 160 lbs, Jamison yana da nauyin 160 lbs + 20 lbs = 180 lbs. Idan John ya auna kashi ɗaya cikin huɗu ƙasa da Maryamu, ya auna 1 / 4 * 160 lbs = 40 lbs fiye da. Jimlar nauyin John shine 160 lbs + 40 lbs = 200 lbs. Jimlar nauyin uku shine 200 lbs + 180 lbs + 160 lbs = 540 lbs. Saboda haka, amsar ita ce 540. 