Answer:
Step-by-step explanation:
Let the total number of students in the band be x:
If 15 students make up 12% of the band, this is expressed as:
12% of x = 15
12/100 * x = 15
12x/100 = 15
12/100 = 15/x
cross multiply
12 * x = 15 * 100
12x = 1500
x = 1500/12
x = 125
Hence the total number of student in the band is 125 students
Comparing the evaluated expression 12/100 = 15/x with 12/100 =?/15 according to my friend, he used x/15 at the right hand side of the equation instead of 15/x as used in the calculation. That was where he made an error.
