exam Maths Puzzle Numerical Ability

If every person in our class shakes hands with every other person in the class exactly once
a. How many handshakes will have taken place if there are 22 students in the class
b.

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exam Other Question
Steven invests $2000 into a GIC which will double every five years, wheras Dana invests $1000 into a GIC which will triple evry three years. How many years will pass before they have the same amount of money? Please help.

Solve the following system by substitution

x + y = 12
y = 2x

Thanks
JMS