Question
The ratio of the number of girls to the number of boys
in a school of 990 students is 2 : 7. If 20 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 3 : 5.Solution
Ratio of number of girls to the number of boys = 2:7 Sum of the terms of the ratio = 2 + 7= 9 
The number of girls in the school = x 990 = 220 and the number of boys in the school = x 990 = 770 Let the number of new girls admitted be x, then the number of girls become (220 + x) After 20 boys leave the school, the number of boys become (770 -20) i.e. 750 According to given, 220 + x = 3 150 220 + x = 450 x = 230
Scheme which is used to assess the current status of soil health and, when used over time, to determine changes in soil health that are affected by land...
Among the following is an example of an amide fertilizer?
Role of extension education in india is perfomed by
For how much time period we can store food grain in rural godown?
Which is the yellow coloured variety of capsicum?
Medium range weather forecast is valid for:
The compression ratio of a carburettor engine varies between
bhindi yellow vein clearing disease is transmited by
Which is the functional component of Oat?
Photosynthetic pathway is a critical factor to consider, particularly since many of the world's most problematic weeds are:
Relevant for Exams:
