In a farm there are cows and hens. If heads are counted there are 180, if legs are counted there are 420. The number of cows in the farm is :
A. 130
B. 50
C. 150
D. 30
Answer: Option D
Solution(By Examveda Team)
Let the number of cows be x.Then, number of hens would be (180 - x)
According to the question
(180 - x) × 2 + 4x = 420
⇒ 360 - 2x + 4x = 420
⇒ 2x = 420 - 360 = 60
⇒ 2x = 60
∴ x = $$\frac{{60}}{2}$$ = 30
Related Questions on Number System
Three numbers are in ratio 1 : 2 : 3 and HCF is 12. The numbers are:
A. 12, 24, 36
B. 11, 22, 33
C. 12, 24, 32
D. 5, 10, 15
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