The value of n in the unknown three numbers is 468.
Value of the missing number
- let the first number = n
- let the sum of the second and third number = y
n + y = 780
if n is 50% more than y;
n = 1.5y
1.5y + y = 780
2.5y = 780
y = 780/2.5
y = 312
n = 1.5y = 1.5 x 312 = 468
Thus, the value of n in the unknown three numbers is 468.
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