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primary 5 | Maths
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Date Posted: 1 year ago
Views: 218
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Average of 5 numbers = 1050 ÷ 5 = 210
Average increased by 6 = 210 + 6 = 216
Sum of 6 numbers = 216 x 6 = 1296
Average increased by 3 = 216 + 3 = 219
Sum of 7 numbers = 219 x 7 = 1533
7th number = 1533 - 1296 = 237
Average increased by 6 = 210 + 6 = 216
Sum of 6 numbers = 216 x 6 = 1296
Average increased by 3 = 216 + 3 = 219
Sum of 7 numbers = 219 x 7 = 1533
7th number = 1533 - 1296 = 237
The second method is easier.
The second method is easier.
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