4.In Amy’s English class, 30% of the students play an instrument. She does not know how many in the whole school play an instrument, but there are 500 students in the school.

Question

4.In Amy’s English class, 30% of the students play an instrument. She does not know how many in the whole school play an instrument, but there are 500 students in the school.
A.Solve the proportion   30/100=n/500   to estimate the total number of students in the school who play an instrument.

Ms. Sue · Answer

30/100=n/500 Cross multiply. 100n = 15,000 Solve for n n = 150