One of the three numbers is x; let the other two numbers be y and z. Since the sum of three numbers is 855, the equation x + y + z = 855 is true. The statement that x is 50% more than the sum of the other two numbers can be represented as x=1.5(y+z),or
x
1.5
=y+z. Substituting
x
1.5
for y+z in x+y+z=885 gives x+
x
1.5
=855 This last equation can be rewritten as x+
2x
3
=855 or
5x
3
Therefore, x equals
3
5
×855=513 Choices A, C, and D are incorrect and may be the result of calculation errors.