Math word problem

Question

A farmer planted a field of Bt corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90,000 kernels on average? What is the farmer's estimate of yield in bushels/acre?

Answer 1

 

                 22 ears                700 kernels          1 bushel

1 acre x ------------------ x ------------------ x --------------------- = 171 bushels

                    1/1000 acre     1 ear                       90000 kernels