90/y
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111.1111
x and y are complementary so x + y = 90 and so y = 90 - x z and q are complementary so z + q = 90 and so q = 90 - z x = z so 90 - x = 90 - z that is y = q
81
The expression is: y/6x
1 The order of operations doesn't matter since it's all division, so we can think of it as 1/(y/y). Since any number divided by itself is one, the y's effectively cancel each other out and it becomes 1/1 which can be further reduced to 1 by the same principle.