The following program draws two boxes, a big one and a small one. The variables ```big``` and ```small``` keep track of the sizes of the two boxes:
var big = 100;
var small = 10;
rect(100, 100, big, big);
rect(100, 100, small, small);
We want to make ```small``` dependent upon ```big```, so that they keep the same proportion when we change them - ```small``` should always be $\dfrac1{10}$ the size of ```big```. What expression should ```small``` store?
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