exam Maths Puzzle Numerical Ability

What is the solution for:

3y-2y-3 = -1
_______
6

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exam Other Question

can yo help me solve this: An airplane was at a crusing altitude, then descended 3,500ft. If the airplane is at 28,500 now, what was the crusing altitude? The demand and supply equations for a certain item are given by:

D = 5p + 40
S = -p^2 + 30p - 8

Find the equilibrium price..... How do I find the price when I am not sure of the actual numbers? Thank you!