Question
The sum of two numbers is 20 and their product is 96.
Find the numbers.Solution
Let the numbers be x and y. x + y = 20 and xy = 96. Using the quadratic: x² - 20x + 96 = 0. Discriminant = 20² - 4*96 = 16. Roots are x = (20 ± √16)/2 = (20 ± 4)/2. This gives us x = 12 or 8. Correct answer: a) 12, 8
612, 487,?, 396, 388, 387
Find the missing number in the given number series.
1, 2, 6, 24, 120, ?What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
Find the missing term in the series:
2, 5, 11, 23, 47, ?
What will come in place of the question mark (?) in the following series?
400, 841, 1202, ?, 1716, 1885
44   45    41   50    ?      59    23
...221, 100, 0, -81, ?
...900 Â Â Â 90Â Â Â 18Â Â Â ? Â Â Â Â 2.16Â Â Â Â 1.08
16, 20, 11, 27, ?, 38
37, 57, 82, ?, 147, 187
