book Maths Puzzle Numerical Ability

twice the sum of 4 and some number is 34 what is the number
could some please help i am stuck thank you mike

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book Other Question

there were 429 people nat a play. admission was $1 for adults and $.75 for children. the receits were $372.50. How many adults and how many children attended the play? a box contain 6 choclates,the mass of the box &choclate is 200 gm.Find the mass of one choclate.Determine the mass of the box.Let B grams represent the mass of a box containing N c