11. Correct answer: 110
A triangle has two equal angles
The lengths of two sides are 50 and 30
The least possible value of the perimeter of the triangle
Topic(s): Types of triangles
If a triangle has two equal angles then it would also have two equal sides.
Given that two sides of the triangle are 50 and 30, then the third side can either be 50 or 30.
For the perimeter to be the least possible value, the third side would have to be 30.
The perimeter is then 50 + 30 + 30 =110.
12. Correct answer: 9
x2 – y2 = 77
(x + y) = 11
The value of x
Topic(s): Difference of two squares, Addition Method
Use the Difference of two squares to factorize.
Now, we have the two equations:
x + y = 11 (equation 1)
x – y = 7 (equation 2)
Use the Addition Method. Add equation 1 to equation 2.
2x = 18
x = 9
13. Any of the following answers is acceptable: 13, 14, 15, 16, 17
A circle is sliced into wedge-shaped pieces
The angle of each tip is greater than 20 but less than 30
One possible value for the number of pieces that can be cut
The most number of pieces =
The least number of pieces =
The number of pieces is between 12 and 18 (not including 12 or 18).
Any of the following answers is acceptable: 13, 14, 15, 16, 17
14. Correct answer: 5
The first term in a sequence is a
Each term after the first is 3 times the preceding term
Sum of the first 5 terms is 605
The value of a
Topic(s): Number sequence problems
15. Correct answer:
Topic(s): Area of triangle
Let QS = x and QV = 3x then from the diagram, SV = 2x
Let PT = 3y and PR = 4y
Area of triangle
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.