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、 (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