a teenager is 75 pounds,it is twice as a kid weight,how many
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a teenager is 75 pounds,it is twice as a kid weight,how many teenagers and kids are weighted 225 pounds?
(1)Three teenagers
(2)Two teenagers + two kids
(3)One teenagers + four kids
(4)Six kids
再问: 怎么算呢
再答: 就是一个teenager重75,三个teenagers共225。3x75=225
而一个teenager跟2个kids一样重。所以2 kids = 1 teenager, 一个个等量替换就好了
1 teenager + 1 teenager + 1 teenager = 2 kids + 2 kids + 2 kids
(2)Two teenagers + two kids
(3)One teenagers + four kids
(4)Six kids
再问: 怎么算呢
再答: 就是一个teenager重75,三个teenagers共225。3x75=225
而一个teenager跟2个kids一样重。所以2 kids = 1 teenager, 一个个等量替换就好了
1 teenager + 1 teenager + 1 teenager = 2 kids + 2 kids + 2 kids
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