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
PAVE : FXDT :: AXLE : FNAE :: BREW : ?
Select the option that represents the letters that, when placed from left to right in the following blanks, will complete the letter-series.
S ...
Select the related number from the given alternatives:
6 : ? :: 5 : 126
Select the figure that will come in place of the question mark (?) in the following figure series.
Five friends Pia, Qia, Ria, Sia, and Tia are sitting together. Tia is at one extreme end. Pia is neighbor of Tia and is third to the left of Qia. Who is...
If P is related to T and Q is related to R in a certain way, then who among the following person is related to O?
Select the number-cluster that is related to third letter-cluster in the same way first letter cluster and fifth-letter cluster is related to second nu...
‘D @ G’ means ‘D is the father of G’,
‘D # G’ means ‘D is the daughter of G’,
‘D * G’ means ‘D is the mother of G’...
Select the set in which the numbers are related in the same way as are the numbers of the given set. (NOTE: Operations should be performed on the whole ...
Relevant for Exams:
