book Maths Puzzle Numerical Ability

find three consecutive odd integers such that four times the sum of the first and third integer is five more than the product of three and the second interger

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have three problems that i am really stuck on and I don't even know where to begin

I HAVE 3 PROBLEMS THAT I AM CLUELESS ON HOW TO ANSWER. HERE THEY ARE

1) IF f(X)=3/8X SQU
Solve fot t: 2t+7 is greater than t+15 and 5t+6 is greater than or equal to 2t+12