MisterXYZ's answer to Cadence's Primary 6 Maths Algebra Singapore question.
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First part of qns you are given the average of 2 numbers to be x. From here, find the total sum of the 2 numbers, which is 2x.
In the next part, the question then tell you the average of 3 numbers is 6. Similarly, find the total sum of the 3 numbers. Which is 18 (3 multiply 6).
Thus, to find the 3rd number in term of x it will be 2x-18. Since, there is no change to the number given in the question from the first part to the second part.
In the next part, the question then tell you the average of 3 numbers is 6. Similarly, find the total sum of the 3 numbers. Which is 18 (3 multiply 6).
Thus, to find the 3rd number in term of x it will be 2x-18. Since, there is no change to the number given in the question from the first part to the second part.
Date Posted:
2 years ago
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