Acceleration of 12 meters/secondsecond2 car mass 1515 kilograms to reach acceleration of 15 meters/second 2

I guess the following digits are only the given but I'm assuming that this is the question:

A car maker has designed a car that can reach a maximum acceleration of 12 meters/second^2. The car’s mass is 1,515 kilograms. Assuming the same engine is used, what should the car’s mass be if the car maker wants to reach an acceleration of 15 meters/second^2?

Then the choices are the following:

A 1,212 kg

B 1,335 kg

C1,466 kg

D 1,515 kg

E 1,894 kg

The answer is E. 1,894 kg.

Solution:

USE ratio and proportion

m1/a1=m2/a2

1515kg/12meter per seconds = (unknown mass) / 15 meters per seconds

let n be the unknown mass

1515 (15) = 12 (n)

1515 (15) / 12=n

n=1,894 kg