You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.
--------
Question: Jenny ran 0.6 mile and walked 0.4 mile. How much farther did Jennyrun than walk?

Answer: 0.2


Question: Irene just bought a new lamp for her bedside table. The old lamp was 1 foot tall and the new lamp is 2.3 feet tall. How much taller is the new lamp than the old lamp?

Answer: 1.3


Question: Sara has 3 green and 5 red marbles. Tom has 4 green marbles. Howmany green marbles do they have in total?

Answer:
7.0