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1[W]x1[秒]=1[J]
75x1000[W]x3600[秒]=2.7x10^8 [J]

すてられた熱量をQとする
0.35=2.7x10^8/(2.7x10^8+Q)
Q≒5.0x10^8

m[kg]とすると
mx4.2x10^7=5.0x10^8+2.7x10^8
m=(5.0x10^8+2.7x10^8)÷4.2x10^7
≒18[kg]
あってますか?

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