book Maths Puzzle Numerical Ability

100=500/2+d
find d

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book Other Question

Please help me solve this problem:

a=32 b=45 c=5

ab / 6c = ?

Would you
32x45=1440
6x5=30
1440/30=48

or
32 x 45= 1440
1440/6=240x5=1200
Can you explain how to solve this in detail? Thank you.

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