The square numbers that give a sum of 90 are 81 and 9. This is because 9^2 is 81, and 81 + 9 equals 90. In mathematical terms, 9^2 + 3^2 = 90.
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You can't write that as the sum of two prime numbers. Note: Goldbach's Conjecture (for expressing numbers as the sum of two prime numbers) applies to EVEN numbers.
There are none. However, there are two consecutive positive odd numbers: 25 and 27.
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To calculate two-thirds of a sum, you first find the sum of the numbers. Then, you multiply the sum by 2/3, which is the same as multiplying the sum by 2 and dividing by 3. This will give you the result of two-thirds of the sum. For example, if the sum is 15, two-thirds of the sum would be (15 x 2) / 3 = 10.