单选题
A sum of $200,000 from a certain estate was divided among a spouse and three children. How much of the estate did the youngest child receive?
(1)The spouse received
of the sum from the estate, and tile oldest child received of 
(1)The spouse received
of the sum from the estate, and tile oldest child received of
【正确答案】
B
【答案解析】[解析] (1)不充分，因为根据(1)无法求出最小的孩子获得多少钱；(2)充分，设两个较小的孩子得到的钱为x，根据题意可以列出下面的方程，从而求出x的值：
2x+(x-12500)+(x+62500)=200000
→x=$37,500
2x+(x-12500)+(x+62500)=200000
→x=$37,500