单选题 A breakfast that consists of 1 ounce of corn puffs and 8 ounces of fruit X provides 257 calories. When 8 ounces of fruit Y is substituted for the 8 ounces of fruit X, the total number of calories is reduced to 185. If fruit X provides 1.8 times as many calories as fruit Y, how many calories does 8 ounces of fruit Y alone provide?
(A) 11.25 (B) 72 (C) 90
(D) 95 (E) 129.6

【正确答案】 C
【答案解析】[解析] 设8盎斯的水果Y单独能供给x卡的热量,则8盎斯的水果X单独能供给1.8x卡的热量,根据题意可得:
1.8x-x=257-185
→x=90