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Addition of Decimals

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Question

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In a map, 0.8 cm represents 8.8 km. How much distance will be represented by 80.5 cm?

(a) 805 km
(b) 855.5 km
(c) 644 km
(d) none of these

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Solution

(d) none of these

0.8 cm represents 8.8 km.

1 cm represents $\frac{8.8}{0.8}$ km.

80.5 cm represents $\frac{8.8}{0.8} \times 80.5$ = 885.5 km.

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