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Direct Proportionality

Five books of...

Question

Five books of height 7 cm and 5 mm each are stacked over one another. What is the total height of the entire stack?

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Solution

Height of 1 book = 7 cm and 5 mm
Total height of five books stacked together =
=5 x (7 cm) + 5 x (5mm)
= 35cm + 25mm
= 35cm + 20mm + 5mm
= 35cm + 2cm + 5mm (10mm = 1cm)
= 37cm 5mm

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