 
<translate> Ọ bụrụ na Meri dị 160 lbs, Jamison dị 160 lbs + 20 lbs = 180 lbs. Ọ bụrụ na John dị otu ụzọ n'ụzọ anọ n'arọ karịa Mary, ọ ga-adị otu ụzọ n'ụzọ anọ n'arọ n'arọ. Ngụkọta ịdị arọ nke John bụ 160 lbs + 40 lbs = 200 lbs. Ngụkọta ịdị arọ maka mmadụ atọ ahụ bụ 200 lbs + 180 lbs + 160 lbs = 540 lbs. N'ihi ya, azịza ya bụ 540. <eng> 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. 