In January, 120 kg heavy March 10% decrease in weight. March 10-100% of the rest = weight% = 90% Weight-March = 90% of 120 kg.= 90% x 120 kg.= 0.9 x 120 kg.= 108 kg
January weighs 120 kg March weight decreased by 10% in March to weight = 100% - 10% = 90% = 90% of the weight of March 120 kg = 90% x 120 kg = 0.9 x 120 kg = 108 kg.