求助 数学题 PP (DS)-48

lucy1006

48. 4122-!-item-!-187;#058&003746
Last Friday each of the pets at a certain veterinary clinic was given either 1 treat or 2 treats. What was the total number of treats given to pets at the clinic last Friday?

(1) The total number of pets at the clinic last Friday was 90.

(2) of the pets at the clinic last Friday were given 2 treats each.
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【答案】C
我不懂得是 为什么不是E呢？！ B只能算出2 treats的数

但不知道 1 treat 那就算A B 一起考量 怎么求得出total number of treats given to pets 呢？！