A certain college party is attended by both male and female students. The ratio of male to female students is 4 to 5. If 15 of the male students were to leave the party, the ratio would change to 1 to 2. How many total students are at the party?	Answers.
A) 60  B) 70  C) 80  D) 90  E) 100
The ratio is 4:5 = 8:10, so there are 8k males and 10k females.   If 15 males left, the ratio would be 1:2 = 5:10, so there would be 5k males and 10k females.   8k-5k = 15   k = 5   8k + 10k = 40 + 50= 
<gadget id="calculator">40 + 50</gadget>
<output>90</output>
90   The answer is 90.
<result>D</result>
A certain college party is attended by both male and female students. The ratio of male to female students is 4 to 5. If 15 of the male students were to leave the party, the ratio would change to 1 to 2. How many total students are at the party?