book Maths Puzzle Numerical Ability

please teach me step by step of this equation: 2(3y+4)=32

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book Other Question

While at the park, I saw boys and dogs. Counting heads, I got 32. Counting legs, I got 104. How many boys and dogs were there? a jar contains 5-gran bolts and 10-gran bolts. the contents of the jar weigh 2.35 KG (1000 G = 1 KG). if there are 300 bolts altogether, how many are there of each kind?