It says three plus this is equal to 19. If it said Julia made an additional $16,000, well then that would make sense, because you could subtract three from both sides and you'd get that result, but that's not what they're saying. Julia made an average of $19,000 per month. Well once again, that's also not right, because we already just said from the beginning, from time zero all the way until the fifth month, she made a total of $19,000, not the average per month is 19,000. Julia made $19,000 in the fifth month. Once again, this is not just saying what happened in the fifth month. This is saying we have the $3,000 from the first month, and then we have the additional from month, between months one and month five.