In a pet shop, there ae only parrots and rabbits. Total heads = 40, and total legs = 100. How many parrots are there ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 30.
Number of parrots = P (2 legs each)
Number of rabbits = R (4 legs each)
P + R = 40 (Total heads) ...(I)
2P + 4R = 100 (Total legs)
⇒ P + 2R = 50 ...(II)
Now, (P + 2R) − (P + R) = 50 − 40
⇒ R = 10
So, P + 10 = 40
⇒ P = 30
Number of parrots = 30