In 10/8 divided by 1/6, you have to do the reciprocal of 1/6 and the dividing symbol... so now it should look like 10/8 times 6/1 . Then you just multiply! <span />
8 x 2 1/4 = 18
the stack is 18 in. thick.
Hope this helps!!
~Kiwi
Check the picture below.
let's recall that a rhombu's sides are all equal.