Posted by NEED HELP on .
A shipment of tv sets, some weighing 30kg each and the others weighing 50kg each, has a total weight of 880kg. If there are 20 tv sets all together how many weigh 50 kg?

math 
bobpursley,
Let L= large, S=small
S+L=20
30S+50L=880kg
does that help? 
math 
ki,
yes! Thanks