The total weight of three tables is 16.9 pounds. The first table is twice as heavy as the second table and the weight of the third table is 1/3 the weight of the second table. What is the weight of table one?

X the 1st table

y the second

z the third

The equation is : x+y+z = 16.9

But we know (given) that x=2y & z = (1/3) y

Calculate everything in term of x:

x = 2y==> x/2 = y

z = (1/3) y = = > & since y=x/2 then z = (1/3) (x/2) = = > z=x/6; y=5.07 & z = 1.69

x + x/2 + x/6 = 16.9===>1.666x = 16.9===> x = 10.14