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Math
Upper primary
小六數學：比率、百分數、速率與圓
練習比和比率、百分數變化、速率、圓周與面積、平均數及圖表判讀。
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1
把 18:24 化成最簡整數比，答案是甚麼？
A
3:4
B
6:8
C
9:12
D
2:3
2
紅球和藍球的數量比是 2:3，共有 25 個球，紅球有多少個？
A
15 個
B
10 個
C
5 個
D
12 個
3
糖和水的比是 1:4，若用 80 毫升水，需要多少毫升糖？
A
16 毫升
B
40 毫升
C
20 毫升
D
320 毫升
4
250 增加 12% 後是多少？
A
262
B
270
C
300
D
280
5
一件物品由 500 元減至 425 元，減幅是多少？
A
15%
B
10%
C
20%
D
75%
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