The answer to this equation would be 63. The "difference" is the comparative analysis of the values, a set of 81 elements has 63 more elements than a set having 18 elements. Or 81-18 = 63.
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The difference between 53 and 81 is 28. This can be calculated by subtracting 53 from 81, resulting in 28. In other words, 81 is 28 units greater than 53 on the number line.
18/81 = 2/9 (divide top and bottom by the hcf of 18 & 81 = 9)
4.5
(81 ÷ 9) × 2 = 18
10 sq is 100 9 sq is 81 100-81 is 19