If 2x(5n) = t, what is the value of t ?
(1) x = n + 3
(2) 2x = 32
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析:
(1) 条件1不能确定n和x的具体值,也就不能确定t的值。
(2) 条件2得到x=16,不能确定n的值,也不能确定t的值。
结合条件1和条件2,由条件2得到x=16,代入条件1得到n=13,所以t=2*16*(5*13)=2080,题目得解。
因此,本题答案为(C),两个条件结合起来才能解题,任何单独一个均不行。
疑惑自己为什么会错呢。这里x和n都是未知量。t也是。