Question
Average age of 10 boys is increased by 6 years when two
of them whose age are 18 and 22 years are replaced by two new members. What is the average age of the new member? TYPE RSolution
Let the sum of the age of two new members be ‘a’. Let the initial average age of boys = x After increment the average age of boys = x + 6 According to question, => 10x – 18 – 22 + a = 10(x+6) => a = 100 Average age of the new members = 100/2 = 50
Solve for x in the equation: 3(x + 2) + 2(2x - 5) = 5x + 9
If x = 19, then the value of x5 - 20x4 + 20x3 - 20x2 + 20x - 1 is
Given a triangle with two sides measuring 12 cm and 16 cm, which of the following cannot be a possible length for the third side?
The mean age of 30 students was calculated as 15 years. However, it was later discovered that one student's age was mistakenly entered as 15 years inste...
In a triangle ABC, a point D lies on AB and points E and F lie on BC such that DF is parallel to AC and DE is parallel to AF. If BE = 4 cm. EF = 6cm. th...
If a = 32, b = c = 31, then find the value of a 3 + b 3 + c 3 – 3abc.
If x3 + y3 = 9 and x + y=3 then the value of x4 + y4 is:
105, 111, 123, 141, ?, 195
Let {x + (1/x)} = 4, then Determine the value of {x² + (1/x²)}
