exam Maths Puzzle Numerical Ability

(cos250*cos25) + (sin250*sin25)

a.k.a. (the cosine of 250 degrees multiplied by the cosine of 25 degrees) plus (the sine of 250 degrees multiplied by the sine of 25 degrees)

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exam Other Question
If ABC
+ DEF
= GHI

and
ADG
+BEH
=CFI

What numbers do you plug into this equation to make it correct both ways. IT says there are two answers. if a wheel that has 3000 revolutions while rolling in a straight line for 45000 in what is the radius of the wheel