Answer:
Step-by-step explanation:
Height of a pile of 7 identical books = 21 cm
so eight of a pile of 1 book 21/7 = 3 cm
therefore, height of a pile of 11 of the same books = 3 × 11 = 33 cm
Hope this helps
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33 cm
7 books ............ 21 cm
11 books ...............x cm
x = 11×21cm/7 = 11×3cm = 33 cm
