Мальчик говорит-"позавчера мне было 10 лет.А в следующим году мне будет 13.Как такое может быть?Это Задача. надо пояснен

у него мозги набекрень

Может быть у него 1 год за 3 идет, может быть хочет быстрее повзрослеть.

Это может быть если мальчик идиот ))))))

может, это с американских учебников переведено. . смысл не так переводчики поняли (не те сейчас переводчики в Министерстве Образования (- лишь бы ЕГЭ протолкнуть)). .
может, имелось ввиду - в позопрошлом году. .
Позвоните в Министерство Просвещения, в Министерство Образования. . Пусть проверят знания выпускающих редакторов, которые допустили такой ужас до магазинов, школ и детей. .
предложите ихним детям по таким учебникам позаниматься. . -Пусть сами попробуют своих детей по таким американским учебникам обучить, от которых уже весь мир открещивается, - в том числе, - и сами американцы..

Да, может, если день рождения у мальчика - 31 декабря, а разговор происходит 1 января. Еще позавчера, то есть 30 декабря, мальчику было 10. Вчера, 31 декабря, уже 11. 31 декабря текущего года ему исполнится 12. А значит в следующем году - уже 13.

!!!!

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Все просто. 10 лет мальчику было 30 декабря. 31-го декабря у него день рождения, и, соответственно, 1-го января он сказал, что "позавчера" ему было 10 лет. Получается, у него будет один день рождения в этом году и еще один - в следующем. Тогда, действительно, в следующем году ему исполнится 13 лет.

День рождения у мальчика явно в конце декабря, числа 31. А говорит об этом 1 января. Получается позавчера ему было 10 лет, 31 декабря исполнилось 11 лет. В январе начался новый год в котором ему будет 12 лет. Ну а в следующем году ему действительно исполнится 13 лет Это же легко!

Может быть он родился в високосный год..