Question
The ratio of the number of girls to the number of
boys in a school of 720 students is 3 : 5. If 18 boys left the school, find how many new girls may be admitted so that the ratio of number of girls to the number of boys may change to 2 : 3.Solution
Ratio of number of girls to the number of boys= 3:5 Sum of the terms of the ratio = 3 + 5= 8 `:.` The number of girls in the school = `(3)/(8)` x 720 = 270 and the number of boys in the school = `(5)/(8)` x 720 = 450 Let the number of new girls admitted be x, then the number of girls become (270 + x) After 18 boys leave the school, the number of boys become (450 -18) i.e. 432 According to given, `(270 + x)/(432)= (2)/(3)` `rArr` 270 + x = 2 `xx` 144 `rArr` 270 + x = 288 `rArr` x = 18
Find the third proportion of 25 and 15.
In which year was the second National Labour Commission constituted under the chairmanship of "Ravindra Varma"?
If 'A > B' means 'A + B', 'A < B' means 'A X B', 'A ≥ B' means 'A - B' and 'A ≤ B' means 'A ÷ B', then what is the value of the expression '45 < 35...
NIPUN Bharat Mission was launched in which year?
Which one of the following is the process in which representatives of workmen and employer involved in an industrial dispute are brought together befor...
If '+' means '÷', '−' means '×', '×' means '+', '÷' means '−', what will come in place of the question mark (?) in the following equation?
<...Which state celebrated “Utkal Day ”
A man travelled at a speed of 20 m/min for 100 min, and at a speed of 70 m/min for 50 min. His average speed is:
The parallel sides of a Trapezium is 20 and 46cm respectively and the non-parallel sides were 10 cm and 24 cm respectively. If the non-parallel sides we...
The ratio between the sum of the digits of a two-digit number and that two-digit number is 1 : 9. If the digit in the unit's place is six less than the ...
Relevant for Exams:
