Question

Solved: x=8 y=12 (used elimination method)

A truck transports 20 boxes of different masses.
Some boxes (C1) weigh 28 kg each , others (C2)
weigh 16 kg each.
Knowing that the total mass of the boxes is
416 kg , how many boxes of each category are
there?​

Answer 1

supose there are only c1

20*28 =560

560-416=144

28-16=12

144/12=12(c2)

20-12=8(c1)

crown?