大人1人の入場料をxと置いて
大人2人→2x
子供5人→2/3x✖︎5
2x➕10/3x =1440
16/3x=1440
16x=4320
x=270
x=270だから大人1人の入場料は270円
2/3✖︎270=180で子供1人の入場料は180円となります
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