SSE JE Electrical Engineering 28 Oct 2020 Shift 1 Papers

Given,
Number of heads = 60
Number of legs = 190
Let number of lions = x
Number of peacocks = y
⇒ x + y = 60
y = 60 - x ——— Equation 1
Number of legs for a lion = 4
Number of legs for a peacock = 2
⇒ 4x + 2y = 190 ——— Equation 2
Substituting y in the equation 2,
4x + 2(60 - x) = 190
4x + 120 - 2x = 190
2x + 120 = 190
2x = 190 - 120
2x = 70
x = 35
Substituting x in equation 1,
y = 60 - x
= 60 - 35
= 25
So, number of lions = 35
Number of peacocks = 25
Hence, the correct answer is "25".