40.
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The sum of the first 40 odd numbers is 1,600.
58 +40 = 98
1/x + 1/y = (y+x)/xy But y + x = sum = 150, and xy = product = 40 So sum of reciprocals = 150/40 = 3.75
It is 40*41/2 = 820
If your number is 4 times ?, and the sum is 40, your problem would be 40 divided by 4. You'd get 10.