Of the 35 students in my class, 11 practice taekwondo, 11 play piano, and 20 take lessons at AoPS. 4 students play piano and go to AoPS, 3 students do taekwondo and play piano, 5 students go to AoPS and practice taekwondo, and 3 students do none of these. How many students do all 3? P. S.: AoPS is just a name.

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%

What is fraction that is equivalent to 3/8

Calculate the effective quarterly compound interest rate equivalent to a 1% of monthly compound interest rate.