The ratio of ducks and frogs in a pond is 37 : 39 respectively. The average number of ducks and frogs in the pond is 142. What is the number of frogs in the pond ?
Options.
A) 148
B) 152
C) 156
D) 145
E) None
Solution:   Ratio of Ducks and Frogs in Pond,   = 37 : 39.   Average of Ducks and Frogs in Pond,   = 142.   So, total number of Ducks and Frogs in the Pond,   = 2* 142= 
<gadget id="calculator">2* 142</gadget>
<output>284</output>
284.   Therefore,   Number of Frogs,= (284 *39)/76 = 145.   Answer: Option 145
<result>D</result>
The ratio of ducks and frogs in a pond is 37 : 39 respectively. The average number of ducks and frogs in the pond is 142. What is the number of frogs in the pond ?