Question
Total number of students in a class is 1920, and the
ratio of number of boys to girls is 7:9. If the number of boys and girls is increased by a% and (a – 2)% respectively, then the total number of students in the class will become 2208. Find the value of a.(Can calculate approx. value)Solution
ATQ, Number of boys in the class before increase = (7/16) ×1920=840 Number of girls in the class before increase = 1920 – 840 = 1080 According to the question: 
So, the value of a is approximately 16.13%.
22% of 560 + 34% of 2160 × 5/12 =? + 16% of 920
? = 65% of 40% of (20 × 250) − 200
The sum of two numbers is 16 and their product is 63. The sum of their reciprocal is equal to:
What will come in the place of question mark (?) in the given expression?
(243/9) X 5 - 112 = ? ÷ (24 - 13)
18 * 9 + 25% of 120 + 50% of 200 = ?
If 14 (x - y) = 2744 and 14 (x + y) = 537824, what is the value of x?
What will come in place of ‘?’ in the given expression :
? – (22 × 25 + 70% of 160) = 272
1280 ÷ 8 + 490 ÷ √49 + ? = 150 * 2
(√ 196 x √ 36 x √ 100) = ?% of 200
Relevant for Exams:
