(a) 4 workers
(b) 8 workers
(c) 14 workers
(a) For 38 pieces, that means that 38/19 = 2 which is twice as many workers are needed as what were needed to make 19 pieces. And since it took 2 workers to make 19, it will take 2 * 2 = 4 workers to make 38 pieces in the same amount of time.
(b) For 76 pieces, that means that 76/19 = 4 which is four times as many workers are needed as what were needed to make 19 pieces. And since it took 2 workers to make 19, it will take 4 * 2 = 8 workers to make 76 pieces in the same amount of time.
(c) For 133 pieces, that means that 133/19 = 7 which is seven times as many workers are needed as what were needed to make 19 pieces. And since it took 2 workers to make 19, it will take 7 * 2 = 14 workers to make 133 pieces in the same amount of time.
