Professor Walt is up for tenure, and wants to submit the portfolio of written student estimation as evidence of his good teaching. He starts by grouping all estimation into 4 categories: good reviews, bad reviews, and medicore reviews, and reviews left blank. When he tallies up piles, Walt gets little concerned: There are 280 more bad reviews than good ones and only half as many blank reviews as bad ones. Good reviews and blank reviews together total 170. On an inpulse, he makes decision to even up piles a little by removing 280 of bad reviews, and this leaves him with the total of 400 reviews of all types. How many reviews were generally in each category.