posted by chris .
find the worlds production of nickel in a year when russia and new caledonia together produced 1/3 of it,canada 1/6 of it,and australia 1/9 of it, and the rest of the world 420,000 tons
rest of world=420000
(1-1/3-1/6- 1/9)W=420 000
(9-3-2-1)/9 * W=420 000
solve for W, worlds production of nickel