A fresh water aquarium contains Molly fish and Guppy fish at a ratio of 15:16. If 35 additional Guppy fish were put in the aquarium, the ratio of Molly fish to Guppy fish would be 15:21. How many Molly fish does the aquarium contain?	Select:
A) 90
B) 105
C) 120
D) 135
E) 150
15x/21x = 15y/(16y+35)   15x=15y   x=y   21x=16y+35   5y=35   y=7   M=7*15= 
<gadget id="calculator">7*15</gadget>
<output>105</output>
105   ANSWER:105
<result>B</result>
A fresh water aquarium contains Molly fish and Guppy fish at a ratio of 15:16. If 35 additional Guppy fish were put in the aquarium, the ratio of Molly fish to Guppy fish would be 15:21. How many Molly fish does the aquarium contain?