3 practice sets · Page 1 of 1
The sum of two numbers is 50 and their difference is 10. What is the product of the two numbers?
600
575
525
650
Correct Answer: A — 600
Explanation:
Let numbers be x and y. x + y = 50, x – y = 10. Solving: x = 30, y = 20. Product = 30 × 20 = 600.
What are the roots of the equation x² – 5x + 6 = 0?
2 and 3
1 and 6
–2 and –3
3 and 4
Correct Answer: A — 2 and 3
Explanation:
Factorising: (x – 2)(x – 3) = 0. So x = 2 or x = 3.
If 3x + 6 = 21, what is the value of x?
3
5
7
9
Correct Answer: B — 5
Explanation:
3x + 6 = 21 → 3x = 15 → x = 5.
