book Maths Puzzle Numerical Ability

Translate the following English sentences into symbols, letting the letter P stand for "Peter studies logic" and the letter S stand for "Susan studies logic."
1. Either Peter or S

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book Other Question

Following an earthquake, two seismologists inspect the surface rupture of the fault that generated the earhtquake. When they are finished collecting data, they get in their cars at 2a=3b-13
b=2a+7

Use substitution method to solve system .
If system is dependant or inconsistant so indicate.