A partially dried clay mineral contaisn 8% water. The original the partially contained 12% water and 45% silica. The % of silica in the partially dried sample is nearly:

Options

A. 0.5
B. 0.49
C. 0.55
D. 0.47

Answer

D

Explanation

`{:("Initial stage","Clay","Silica","Water"),(,43%,45%,12%),("Final stage",(92.x),x,8%):}`
Ratio of silica and clay will remain constant, before and after drying.
`therefore (45)/(43)=(x)/(92-x)`
`x=47%`.