The rocket has a 2/3 chance of landing in the grassy area, 2 out of 3 areas in the total area are grassy. Cross multiply to turn 2/3 into a percentage, and you get 66%. You can also divide 2 by 3 to get a 0.66 chance. Presuming that 0.2, 0.3, 0.4, and 0.6 are your answer options for this equation, i would say 0.6. If not then the answer is 0.66, 66%, or 2/3 chance