 <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. <yor> Bí Mary bá wúwo 160 lbs, Jamison wúwo 160 lbs + 20 lbs = 180 lbs. Tó bá jẹ́ pé ìwọ̀n John kéré sí ti Mary ní ìdajì, a jẹ́ pé ó ti sanra sí i ní ogójì kìlógíráàmù. Àpapọ̀ ìnira John jé 160 lbs + 40 lbs = 200 lbs. Àpapọ̀ ìnira àwọn mẹ́ta náà jẹ́ 200 lbs + 180 lbs + 160 lbs = 540 lbs. Nítorí náà, ìdáhùn náà ni 540. 