One way is: 10 + 10 + 10 + 10 = 40
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Numbers are x, x +2 and x + 4 x (x+2) = (x+4)^2 - 40 x^2 + 2x = x^2 + 8x + 16 - 40 2x - 8x = 16 - 40 -6x = -24 x = 4 Numbers are 4, 6 and 8 Check: 4 x 6 = 24, 8^2 - 40 = 64 - 40 = 24 QED
To find numbers between 30 and 40 that are divisible by both 4 and 9, we need to find the least common multiple of 4 and 9, which is 36. The numbers between 30 and 40 that are divisible by 4 and 9 are 36.
2 and 40 4 and 10
If your number is 4 times ?, and the sum is 40, your problem would be 40 divided by 4. You'd get 10.
30