book Maths Puzzle Numerical Ability

what is the property for the angle ocb=90 degees when you when you have to solve angle1+angle3=90degrees

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book Other Question

SUPPOSE EACH ORDER PAIRS ARE FOR THE SAME DIRECT VARIATION. FIND EACH MISSING VALUE.
A. (-1,2)AND (4,Y)
B. (X,-4) AND (-9,-12)
Here is another:
Solve for a s=1/2(a+b+c)