Correct Answer - Option 1 : 25
Let M = number of people using the metro.
C = number of people using cab.
B = number of people using bus.
T = Total population.
Given that
\(\frac{B-M}{M}\times100 =25\)
\(\frac{B-M}{M} =\frac{25}{100}=\frac{1}{4}\)
\(4(B-M)=M\)
\(B=1.25M\) ---(1)
Similarly,
\(\frac{M-C}{M}\times100 =25\)
\(C=0.75M\) ---(2)
No person uses more than one transport option also, people using public transportation is 75% of the total colony population.
\(\therefore C+B+M=0.75T\) ---(3)
Putting equations (1) and (2) in (3).
\(0.75M+1.25M+M=0.75T\)
\(3M=0.75T\)
\(M=0.25T\) ---(4)
From equation (4), we can say that number of people using metro is 25% of the total population.