Question
A number is first increased by 50% and then decreased by
50%. If the net change in the number is 400, then find the original number.Solution
ATQ, Let the original number be '100a'. Final number = 100a x (150/100) x (50/100) = '75a' Net decrease = 100a - 75a = '25a' Or, 25a = 400 Or, 'a' = 400 / 25 = 16 Therefore, required number = 100a = 16 x 100 = 1600
In a class of 70 students and 25 teachers, each student got gifts that were 20% of total number of students and each teacher got gifts that were 10% of ...
If, 4x2 + y2 + 12x + 6y + 18 = 0, then find the value of (2x + y)/(y + 6x).
A number is increased by 20%, and the resulting number is decreased by 20%. If the initial number is ₹x, the final number is ₹2880. What is the valu...
A man running at the speed of 6 kmph was over taken by the train moving with the speed of 78 kmph in 20 seconds. Find the length of train.
If (a + b) = 11 and ab = 25, then find (a² + b²).
Which of the following statements is correct?
I. If x = 12, y = –2 and z = –10, then x³ + y³
+ z³ = 720
II. If x + y = 48 an...
In a best-of-two chess match between Player X and Player Y, the probability that Player X wins a game is (5/9), and the probability that Player Y loses ...
Relevant for Exams:
