Let the present ages of ‘A’, ‘B’ and ‘C’ be ‘12x’ years, ‘13x’ years and ‘16x’ years, respectively. ATQ; (16x + 12x) ÷ 2 = 28 Or, 28x = 56 So, x = 2 So, present age of ‘C’ = 16 × 2 = 32 years Present age of ‘B’ = 13 × 2 = 26 years Difference between the ages of ‘B’ and ‘C’ = 32 – 26 = 6 years So, age of ‘B’ when ‘C’ was 20 years old = 20 – 6 = 14 years
I. x2 + 13x + 42 = 0
II. y² + 13y + 40 = 0
What is the speed of the stream if a ship takes 15 hours to travel 240 km in calm waters, given that the ratio of its speed against the current to its s...
I. 3x2 – 16x + 21 = 0
II. y2 – 13y + 42 = 0
I. x3 = 1728
II. y2 – 15y + 56 = 0
I. 2x² - 7x + 3 = 0
II. 8y² - 14y + 5 = 0
I. 2y2 + 31y + 99 = 0
II. 4x2 + 8x – 45 = 0
How many values of x and y satisfy the equation 2x + 4y = 8 & 3x + 6y = 10.
I. 3p² - 17p + 22 = 0
II. 5q² - 21q + 22 = 0
If 4x = 40, 3y = 33, what is the value of 6x + 4y?
I. (x13/5 ÷7) = 5488 ÷ x7/5
II. (y2/3 × y2/3 ) ÷ √4 = (343y)1/3...