Adult tickets for a play cost $5.50 and a child ticket cost $3.50. they sold 550 tickets and collected $2139.00. how many adult tickets sold

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!