So those are fractions^ The first thing you do here is cross-multiply. (It doesn’t matter which sides you multiply together first) So 250 times x= 250x Then cross multiply 80 and 100 to get: 8,000 You now have ur new equation: 250x=8,000 The next thing you do here is divide both sides by 250, since 250 is the number with a variable in it (aka “x”) You then get: 32 students as you’re final answer. I hope that helped you understand !