Question
The average score of a class of boys and girls in
examination is X. The ratio of boys and girls in the class is 4:3. If the average score of the boys (X + 2), the average score of the girls is:Solution
Let there be 4n boys and 3n girls Total score = (4n + 3n)
X = 7nX Total score of boys = 4n(X + 2) = 4nX + 8n Total score of girls = 7nX – (4nX + 8n) = (3nX – 8n) Average score of girls = ((3nX – 8n))/3n =  (3X - 8)/3
27.27% of 5501.22 + 12.53% of 158.99 – √ 1599 = ?
98.999 x 99.001 + 640.856=?
[15.87% of 599.97 + 40.08 Ă— ?] Ă· 4.04 = 8.082.02
If a:(b+c) =3:9 and c:(a+b) =10:14 then find the value of b:(a+c)?
119.98% of 80.02 - 15.12 Ă— 2.02 + 19.95 = ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
A number is first increased by 35% and then decreased by 35%. If the net change in the number is 302.5, then find the original number.
What approximate value will replace the question mark (?) in the following?
18.99...
215.003X4.021 + 11.05 + 71.02 =?
A motor boat goes downstream from point A to B ,which is 36 km away from point A, and then returns to A. If actual speed of the boat in still water is 7...
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