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標題:

maths之英文題的百分數 好難 help me

發問:

1. A hawker bought 750 eggs, 25of them were broken. Find the percentage of eggs that were broken.2. 450 boys and 550 girls sat an examination, 80% of boys and 60% girls passed the examination. Find (a) the number of boys who failed the examination; (b) the number of girls who failed the examination; ... 顯示更多 1. A hawker bought 750 eggs, 25of them were broken. Find the percentage of eggs that were broken. 2. 450 boys and 550 girls sat an examination, 80% of boys and 60% girls passed the examination. Find (a) the number of boys who failed the examination; (b) the number of girls who failed the examination; (c) the percentage of students who failed the examination. 呢幾條題來自Train Up MATHEMATICS 1 (S.1-S.2)

最佳解答:

1. A hawker bought 750 eggs, 25of them were broken. Find the percentage of eggs that were broken. The percentage of eggs broken was 25/750 x 100% =3.33% 2. 450 boys and 550 girls sat an examination, 80% of boys and 60% girls passed the examination. Find a) the number of boys who failed the examination 450 x (1-0.8)=90 boys explanation: There were 80% of boys passing the examination, which meaned 20% of them got passed. (b) the number of girls who failed the examination; 550 x (1-0.6)=220girls (c) the percentage of students who failed the examination. The total number of students participating in the examination was 450+550=1000students, and there were 310 students (90boys and 220 girls) getting a fail in it. Therefore, the percentage of students who failed the examination was 310/1000 x 100%= 31% Hope you can understand my explanations.

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1.25/750*100% 3又3分1 2a.90 2b.220 2c.90+220/450+550 *100% 31%|||||1. Percentage of eggs that were broken = 25 / 750 * 100% = 3.3333% 2. (a) 80% of boys passed the examination imply that 20% of the boys failed the examination. Number of boys who failed the examination = 450 * 20% = 90 (b) 60% of girls passed the examination imply that 40% of the girls failed the examination. Number of girls who failed the examination = 550 * 40% = 220 (c) Total number of students = 450 + 550 = 1000 Total number of students who failed the examination = 90 + 220 = 310 Percentage of students who failed the examination = 310 / 1000 * 100% = 31%|||||1.25/750x100%=33 1/3% 2.450x (1-80%)=90 b.550x(1-60%)=220 c.(90+220)/(450+550)x100%=31%A215E4A27F624C16