book Maths Puzzle Numerical Ability

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Solve for a s=1/2(a+b+c)

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book Other Question

A board game for 2 to 6 players has a deck of cards that can always be divided evenly among all the players. What is the smallest numbers of cards that are possible? what is the soultion to this simultaneous equation using substion or addtion method?
2x+3y=-5
3x-y=20