Michelle uses 40 beads in making a necklace. She uses 5 blue beads and 2 times as many red beads as blue beads. Then she uses the same number of white beads as the blue and red beads combined. If the rest of the beads she uses are silver, how many silver beads does she use?
Michelle uses 5 x 2 = 
<gadget id="calculator">5*2</gadget>
<output>10</output>
10 red beads.
She uses 5 + 10 = 
<gadget id="calculator">5+10</gadget>
<output>15</output>
15 white beads.
So she uses a total of 5 + 10 + 15 = 
<gadget id="calculator">5+10+15</gadget>
<output>30</output>
30 blue, red, and white beads.
Therefore, she uses 40 - 30 = 
<gadget id="calculator">40-30</gadget>
<output>10</output>
10 silver beads.

<result>10</result>