6 large + 5 small = 127 kg ------------ (1)
2 large + 3 small = 51kg ------------ (2)
(2) x 3 :
6 large + 9 small = 153 ---------------- (2a)
(2a) - (1) :
4 small = 26
1 small = 6.5kg ------------ (sub into equation 1)
6 large + 5 small = 127 kg
6 large + 5(6.5) = 127
6 large + 32.5 = 127
6 large = 127 - 32.5
6 large = 94.5
1 large = 15.75 kg
Answer: The small box weighs 6.5kg and the big box weighs 15.75 kg
