please help me!!! ?

Question

 

math problem Water evaporates from a swimming pool at an approximately constant rate of 35 gallons of water for a pool with a surface area of 100 square feet to 90 gallons for a pool with a surface area of 400 square feet.

(a)

What is the evaporation rate per square foot of surface area (in gal/ft2)? Round to the nearest hundredth.

110/3( is this answer correct?) gal/ft2 

(b)

How many gallons of water will evaporate from a pool of 200 square feet? Round to the nearest gallon.

 gal

Answer 1

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IF we assume the rate is constant then it is [ 90 - 35 } / [ 400 - 100] = 55 / 300 gal / ft²

now multiply this by 200