How do I solve this?

Question

There are 171 seventh graders eating lunch. This number represents 45% of all of the seventh grades. How many 7th graders are there in the school?

Would I take 171 x 45% and add them together or take 171 X .55 or??

Answer 1

Do you know algebra?

let the number of students be x

.45x = 171
x = 171/.45
x = 380

or do it by the "3 step process"

45% represents 171
so 1% = 171/45 = 3.8
100% = 100*3.8 = 380

Answer 2

How do I solve this word problem
to do with fractions ro

What is one seventh of 6.3?