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Question

A sample of clay was partially dried. It was found to contain 50% silica and 7% water. The original clay contained 12% water. If x percentage of silica is present in the original sample then, determine the value of 10x.

A
473
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B
470
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C
480
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D
None of these
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Solution

The correct option is A 473
On drying, the weight of water changes but the ratio of silica with other materials remains constant. If x is the % of silica in the original sample, (88x) is the weight of the materials other than water and silica.
x88x=5043x=47.3
Therefore, 10x=473.

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