Question

Define an operation on three numbers—a top number, a lower-left number, and a lower-right number—whose value is (top number) $+$ (lower-left number) $-$ (lower-right number). For example, top $5$ , lower-left $4$ , lower-right $6$ gives $5 + 4 - 6 = 3.$ What is the sum of the operation applied to top $1$ , lower-left $3$ , lower-right $4$ and the operation applied to top $2$ , lower-left $5$ , lower-right $6?$

$-2$

$-1$

$0$

$1$

$2$

Answer: D

Concepts:custom operation

Difficulty rating: 820

Solution:

The first triple gives $1 + 3 - 4 = 0,$ and the second gives $2 + 5 - 6 = 1.$

Their sum is $0 + 1 = 1.$

Thus, the correct answer is D .

1992 AMC 8 Problem 6

Answer: D

Solution:

Problem 6 in Other Years