exam Maths Puzzle Numerical Ability

Problem Solving With Systems of A line: How to Solve
The difference of the measures of two supplementary angles is 35. Find both angle measures. The sum they add up to is 180.

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Pr=1.4pm*3.14d^2/4
Pe=3.14^2/2*EJ/L^2
J=3.14d^4/64

If pm=4, E=2.07*10^5 and L=10 find the value of "d" so that:
Pe=2Pr In order to full a water tank three pipes producing 12L/min, 16L/min, 20L/min of water are turned on at 30 min intervals. If they are turned on in the order given, how long after the first pipe is turned on will a 1200 L tank be filled?