book Maths Puzzle Numerical Ability

Find the nth term of the arithmetic sequence,
a(1 symbol)=8, d=3,n=16

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1/12 + 3/x = 2/x+1 Quadratic formula Deborah has a recipe that makes 4 dozen chocolate chip cookies. It requires 2 cups of chocolate chips for every 5 cups of flour. If she needs 36 cookies, how many cups of chocolate chips will she need?