40% of students at rock-ledge middle school are musicians. 75% of those musicians have to read sheet music when they play their instruments. if 38 students can play their instruments without reading sheet music, how many students are there at rock-ledge middle school?

answer this from my math problem set due monday! and plz explain i dont understand it all that well. the would be nice you so much!

There are 380 students at Rock-Ledge Middle School.

To figure it out, you have to start by figuring out the total amount of students in band. If 38 = 25% then   38 x 3 = 75% so 114 = 75%. That means there are 152 students in band. That means 40% of the students are in band. Because 20s are easier to work with, you can transfer the 40% to 20% which equals 76. If 76 = 20% then 76 x 4 = 100% so the total number of students is 380!

If you need more help, just comment what you don't get.