3/4 of the students in a school were girls and the rest were boys. 2/3 of the girls and 1/2 of the boys attended the school carnivel. Find the total number of students in the school if 330 students did not attend the carnivel.

Answer 1

what have they told you? If there are x students, then
g = 3/4 x
b = 1/4 x
1/3 g + 1/2 b = x-330
substituting for b and g,
1/3 * 3/4 x + 1/2 * 1/4 x = x - 330
...