Q33- In a public School 1-5 th of girls and 1-4 th of boys are under 12 years of age- If the total strength of the school is 1000 and number of girls is 2-5 th of the total strength of the school- Then the percentage of student of 12 and above 12 years is-

The correct option is D (d) 77 Total girls in a school=2/5×1000 =400 girls Total boys in school=600 4/5th of girls and 3/4th of boys are 12 years ...

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Q33. In a pub...

Question

Q33. In a public School $\frac{1}{5} t h$ of girls and $\frac{1}{4} t h$ of boys are under 12 years of age. If the total strength of the school is 1000 and number of girls is $\frac{2}{5} t h$ of the total strength of the school. Then the percentage of student of 12 and above 12 years is:

(a) 23%

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(b) 45%

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(d) 77%

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Solution

The correct option is D
(d) 77%

$T o t a l g i r l s i n a s c h o o l = \frac{2}{5} \times 1000 = 400 g i r l s T o t a l b o y s i n s c h o o l = 600 \frac{4}{5} t h o f g i r l s a n d \frac{3}{4} t h o f b o y s a r e 12 y e a r s o n a b o v e \frac{4}{5} \times 400 + \frac{3}{4} (600) = 320 + 450 = 770 P e r c e n t a g e o f s t u d e n t a b o v e 12 y e a r s = \frac{770}{1000} \times 1000 = 77.1$

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Q33. In a public School 15th of girls and 14th of boys are under 12 years of age. If the total strength of the school is 1000 and number of girls is 25th of the total strength of the school. Then the percentage of student of 12 and above 12 years is:

The correct option is D (d) 77% Total girls in a school=25×1000 =400 girlsTotal boys in school=60045th of girls and 34th of boys are 12 years on above 45×400+34(600)=320+450=770Percentage of student above 12 years=7701000×1000=77.1

Q33. In a public School $\frac{1}{5} t h$ of girls and $\frac{1}{4} t h$ of boys are under 12 years of age. If the total strength of the school is 1000 and number of girls is $\frac{2}{5} t h$ of the total strength of the school. Then the percentage of student of 12 and above 12 years is: