For laying of a garden prepared... apple-trees. How many apple-trees needed to be planted if 5 rows, on 16 apple-trees in each row are already put? Add conditions and solve a problem. PLEASE HELP PLEASE URGENTLY

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5*16=80.............. Prepared (100) apple-trees put the 5th row. - on 16 apples 1)16*5=80 (yabl) it is put 2)100+80=20 (yabl) Answer: it was necessary to plant 20 apple-trees.
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Answer add