A swimming pool is open for 7 1/2 hours during a day. The pool keeps one lifeguard on duty at a time and each life guards shift is 1 1/2 hours long. How many shifts are there per day

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)