1.Mary is 12 years old.two years ago,she was twice as old as her brother Jack.How old is Jack now?(12-2)/2+2=7How old will Mary be when Jack is twice his present age?7*2+5=192.Peter is 15 years old.Th...
英语开放探究题1.Mary is 12 years old.two years ago,she was twice as
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