The figure below shows a ruler kept on the wall, where the wall is covered with square tiles. How long is tile AB?

13 cm

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7 cm

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3 cm

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10 cm

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Solution

The correct option is B 7 cm
The given figure shows how to measure the length of a tile. A 20 cm ruler is placed parallel to the longer edge of the tile. The left edge of the tile is placed exactly at the 3 cm mark of the ruler while its right edge coincides with the 10 cm mark. The difference between the readings gives the length of the tile, i.e. 10 cm – 3 cm = 7 cm.

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