Jamal watched his older brother Robert lift weights. The bar alone had a mass of 20 kg. on the bar he had two 11.4 weights, two 4.5 kg weights, and four 450 g weights. What mass was Robert lifting?
What you have to do is add them all! 20 bar 11.4 2 11.4 weights 11.4 4.5 2 4.5 weights 4.5 450.0 4 450 weights 450.0 450.0 +450.0 --------- 1.8 10 200 +1,600 -------------- 1,811.8 is the answer
