Both given ratios compare a city's value to GOA's value, so it helps to rewrite everything in terms of GOA rather than working with three separate unknowns.
The first relation, PUNE divided by GOA equals 1, tells us PUNE and GOA carry exactly the same value. The second relation, CHENNAI divided by GOA equals 1.5, tells us CHENNAI's value is one and a half times GOA's value.
Since PUNE equals GOA in value, any ratio taken over PUNE in the denominator behaves exactly like the same ratio taken over GOA in the denominator. So MUMBAI divided by PUNE carries the same value as MUMBAI divided by GOA, following the same one-and-a-half-times pattern already established by CHENNAI over GOA.
Because PUNE equals GOA in value, the ratio MUMBAI over PUNE mirrors the ratio CHENNAI over GOA, giving 1.5.
the correct answer is Option C: 1.5.
