It’s 3am.. I’m tired.. but is this equation missing some information?🤔

Mathematically challenged here...but even I was able to figure out that it had to be 50.

Nope, it's all good.

Let n = number of students, p = number passed, f = number failed.

Obviously n = p + f, right?

p = 35 (given)
f = 30% of n = 0.3 * n

so

n = 35 + 0.3 * n

n - 0.3 * n = 35

0.7 * n = 35

n = 35 / 0.7 = 50

So they are saying 35 is 70% of 50?

This type of math is not my bright spot either 😳

50. So 15 failed.

If we know 70% passed and 70% = 35

.7X = 35
X = 35/.7 or X=350/7 So X = 50

Ugh....nope....brain hurts

50.