book Maths Puzzle Numerical Ability

the sum of the first nine terms of an arithmetic progression is 75 and the twenty-fifth is also 75. find the common difference and the sum of the first hundred terms.

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book Other Question

Joe's Muffler employs supervisors and helpers. According to the union contract, a supervisor does 2 brake jobs and 3 mufflers per day, while a helper does 6 brake jobs and 3 muffl Write the algebraic expression that corresponds to five times the sum of a number and the opposite of 12.