Question
In a school, the average number of books that some
numbers of boys have is 80 and average number of books that some numbers of girls have is 50. If each boy have read 5 books then the average numbers of unread books with all the students become 70. The total number of boys is what percentage of the total number of students in that school?Solution
Let the total number of boys be x. and the total number of girls be y. The total number of books boys have = 80x The total number of books the girls have = 50y If each of the boy have read 5 books, then the remaining number of unread books = 80x – 5x = 75x The sum of the all the books = 70(x + y) = 75x + 50y 20y = 5x x : y = 4 : 1 Required % = (4/5) × 100 = 80%
Which of the following property of soil is not influenced by tillage operations?
White grub in maize can be controlled byÂ
The condition where the plant is unable to produce a zygote with its own pollen is called as?
Pseudo dominance is related with
____ is a milk process that makes milk more easily digested by those with a sensitive digestive system.
Which of the following elements has not been proved to be essential for plants?
Sedges are monocot with triangular stem and parallel venation and belong to ______ family.
When fruit develops from the mere stimulus of the pollination, but without fertilization it is known as_____
If the time shown in a clock is 8:20, then what will be the clock angle made by minute and hour hands?
A Chromosome with medium position of centromere is known as
