Test # 446 [20-Sep-2017]

1.
The average between a two digit number and the number obtained by interchanging the digits is 9. What is the difference between the two digits of the number?

Test Index

In their lifetime, house cats spend approximately 10,950 hours purring      .. More >>

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### The Essential Colors

Color:
Strange and unexpected facts await us at every turn in science! If the rotating cardboard disk is painted one third red, one third green, and one third blue, the resulting color is white. While the mixture of the spectral colors produces white, it is not necessary to have all of the spectral colors in order to obtain white; because a mixture of the following colors alone, red, green, and blue, will give white. Moreover, by the mixture of these three colors in proper proportions, any color of the spectrum, such as yellow or indigo or orange, may be obtained. The three spectral colors, red, green, and blue, are called primary or essential hues, because all known tints of color may be produced by the careful blending of blue, green, and red in the proper proportions; for example, purple is obtained by the blending of red and blue, and orange by the blending of red and yellow.