Explanation of the steps:
Cat ++ Mouse =8kg=8??
Dog ++ Mouse =11kg=11??
Dog ++ Cat =15kg=15??
⇒2(⇒2(Cat ++ Mouse ++ Dog)=8+11+15=34)=8+11+15=34
⇒⇒ Cat ++ Mouse ++ Dog =34:2=17(kg).
Math problems for elementary school students
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