exam Maths Puzzle Numerical Ability

Solve the equation: 3/5x+7=x-4/10+2

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exam Other Question

a worker is hired for 20 days. on the first day he makes 1 cent on the 2nd day he makes 2 cents and the pay doubles each day. What is the total pay? Find the prime factorization of the number 330

No idea about the prime factorization thing. Can someone please help me?