exam Maths Puzzle Numerical Ability

please help

simplify

4^0 - 64/2^4 - (-3)^0 - 3^0 - 2[(-3-2^0) - (-3 -2)]

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exam Other Question

state weather the ratios are proportional

1. 50 over 40 equal 5 over 4

2. 12 to 11, 36 to 33

3. 20:40, 1:2

4. 33 over 36 equals 44 over 48 Can you show me differenet ways of converting metric units into other metric units or web site thank you