exam Maths Puzzle Numerical Ability

Can you help me solve this problem? 5a + 6b + 7a=

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exam Other Question

In triangle CDE, CD=3y, DE=30, and CE=45. Determine the range possible values for y

I think the answer is 5 I am thinking of three consecutive positive numbers. If i multiply the first with the third and then add the second, the result is 41. Let x be the smallest number.