The persent ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to increase by 50 students and the number of teachers were to increase by 5, the ratio of students to teachers would then be 25 to 1. What is the present number of teacher?

The cost, in taka, of manufacturing x microwaves is 6000+300x taka. The amount received when selling these x m...

The larger of two numbers exceeds twice the smaller number by 9. The sum of twice the larger and 5 times the s...

In the figure, what is the value of a?

Find the probability of selecting a prime number from a set of number 1 to 15 (both inclusive).

If 4% of (P+Q) are 8 and P is a positive, what is the greatest possible value of Q?

The sum of two numbers is equal to thrice difference. If the smaller of the numbers is 10 find the other numbe...