J's answer to Lena's Primary 5 Maths Whole Numbers Singapore question.
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A + B = 964
A + C = 1146
B + C = 1106
Add all of them together,
A + B + A + C + B + C = 964 + 1146 + 1106
2A + 2B + 2C = 3216
Divide both sides by 2,
A + B + C = 3216 ÷ 2 = 1608
Average of A,B and C = 1608 ÷ 3 = 536
A + C = 1146
B + C = 1106
Add all of them together,
A + B + A + C + B + C = 964 + 1146 + 1106
2A + 2B + 2C = 3216
Divide both sides by 2,
A + B + C = 3216 ÷ 2 = 1608
Average of A,B and C = 1608 ÷ 3 = 536
Date Posted:
3 years ago
Thk u J!
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