xをケーキ、yをシュークリームとする
250x+200y=4400
2:3=x:y
2y=3x
250x+100×3x=4400
250x+300x=4400
550x=4400
x=8
2y=3×8
y=12
ケーキ8個、シュークリーム12個
まちがってたらごめんなさい
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