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# [x] is the greatest integer less than or equal x, what is the value of

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Re: [x] is the greatest integer less than or equal x, what is the value of [#permalink]
Since$$5 = √25 < √30 < √36 = 6$$, we have $$[√30] = 5$$.
Since $$6 = √36 < √40 < √49 = 7$$, we have $$[√40] = 6$$
Since $$7 = √49 < √50 < √64 = 8$$, we have $$[√50] = 7$$
Thus $$[√30]+[√40]+[√50] = 18.$$