Question

How many tiles whose length and breadth are 13 cm and 7 cm

respectively are needed to cover a rectangular region whose length and

breadth are 520 cm and 140 cm?

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Answer 1

Answer:

$length \: of \:1 \: tile = 13cm \\ breadth \: of \: tile = 7cm \\ area \: of \: 1 \: tile \: = 13 \times 7cm ^{2} \\ length \: of \: rect. \: region \: = 520cm \\ breadth \: of \: rect.region \: = 140cm \\ area \: of \: rect.region \: = 520 \times 140cm ^{2} \\ no.of \: tiles = \\ area \: of \: rect.region \div area \: of \: 1 \: tile$

$520 \times 140 \div 13 \times 7 \\ = 800$