9. In certain scholl, 20% of students are below 8years of age. The number of std above 8 yrs of age is 2/3 of the number of std of 8 age which is 48. what
is the total number of std in the school?

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.