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
The RBI’s methods of credit control may be broadly divided into the parts:Â
A land scraper is a piece of heavy equipment typically used for which of the following?
On the basis of climatic condition, Walnut is an example of which type of fruit crop?
Microspores that are found directly on microsporangia and are not covered, are classified in which division?
What is the function of the governor in a diesel engine?
Meiotic division takes place in:Â
Downy mildew or Green ear disease of Sorghum is ______
Under high light levels and high temperature, which type of plant will perform photosynthesis quicker and more effectively?
The optimum temperature for growth and head of cabbage is ________
The harrow type suitable for hard and stony soils, featuring tough flexible teeth with a spring action is
Relevant for Exams:
