Number System, Problems on Number

Anita had to do a multiplication. instead of taking 35 as one of the multipliers, she took 53. As a result, the product went up by 540. What is the new product?

What is the value of

Evaluate :

Half of 1 percent written as a decimal is ________

The average of a non-zero number and its square is 5 times the number. The number is-

If 2^x + 2^y = 2²², what is the value of x + y?

Which of the following fractions is the largest?

A sum of Tk. 312 was divided among 100 boys and girls in such a way that each boys gets Tk. 3.6 and each girl Tk. 2.4. The number of girls is :

If 5(3a - 7) = 20, then what is the value of (3a - 8)?

Jim is a car salesman who gets a base monthly salary and a commission for each car he sells. Jim's monthly earnings are given by the function f(x) = c(4+ x), where x represents the number of cars he sold for the month. If Jim sells 6 cars in a month he earns $2,000. How much is Jim's base salary ?

How many positive integers less than 500 can be formed using the number 1, 2, 3 and 5 for the digit?

Halim purchased brand A pen for Taka 200 each and brand B pen for Taka 100 each. If he purchased a total of 8 of these pens for Taka 1,200 how many pens of brand A did he purchased?

The next number in the sequence 3, 4, 8, 17, 33, … … is

After dividing a positive integer Y by 3, the remainder is 2; but when Y is divided by 7, the remainder is 4. What is the least possible value of Y?

If you subtract - 1 from + 1, What will be the result?

If 15 is the 6th number in a series of 6 consecutive odd numbers what is 4th number in the series?

a, b, c, d and e are five consecutive integers in increasing order of size. Which one of the following expression is not odd?

Each boy contributed money equal to the number of girls and each girl contributed money equal to the number of boys in a class of 60 students. If the total contribution thus collected is Tk. 1,600, how many boys are there in the class?

The average daily wage of 10 workers is Tk. 400. if the lowest wage is Tk. 300, then what is the possible maximum wage?

85% of a number is added to 24, the result is the same number. Find the number?