explosion of diamonds

when a volcano blows up it gushes with glowing  red hot melted  rock called lava. It's hotter  than 1300 degrees  f so  it can melt just about  anything in it's  way. but one thing it can't   melt is diamond.   some cooled lava rock have  diamond inside  Them. now there aren't  a lot of diamond mixed in so you'd have sort through  about 250 full dump truck  of lave to find 1 cart  of diamond  (less than 1/100th of an ounce.) But  there are  specks of other materials inside lava too. If you ever buy lava rock for a grill put a rock in socks and hit it with a hammer to split it open (with a grown  up  help.)Here  at bedtime math we  smash 6 lave rock and found a chip  of  white quartz in 3 them. see if you find anything in yours. lava rocks for the grill are about  the size of your fist find 3 object in your room about that size item might include small stuffed animals toy balls or regular rocks from outside. If you smash 6 rocks and 1 has a diamond  in it how many don't  5 rock.  If  you buy of 10 lava rocks and count them as you crack them open  what's  the second to last number you say 9. If you're cracking open 40 lave rock of which 22 have a diamond and 27 have gold  inside them what's the smallest possible number of that have both  9 rock since only 18 of the  27 gold can have on diamond. If you can find one diamond in every 250 dump trucks of lava how many should you find in  1,000 trucks 4 diamonds since  you have 4 sets 250 truck.