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
Which is not a timber yielding tree species?
What is the chromosome number in the endosperm of a flowering plant if its diploid number is 36?
If the base sequence of a codon in mRNA is 5’-AUG-3’, the sequence of mRNA pairing with it must be
Match List-I with List-II and select the correct answer using the codes given below.
What is the agricultural practice of cultivating two or more crops simultaneously on the same piece of land, without following a specific row arrangement?
The primary goal of seed priming is to:
Which of the following is the major anthocyanin responsible for red coloration in rose petals?
Site for protein synthesis is _______
Glutathione -S-transferase is responsible for the selectively of
First product of urea hydrolysis in soil is
Relevant for Exams:
