One third of a number b multiplied by -11 is more than 2/3

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?

Extra points! find the missing dimension! need asap

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount