book Maths Puzzle Numerical Ability

find 3 consecutive odd intergers so that 30 more than the first number is 31 less than twice the middle number

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book Other Question

Find the value of x in the equation 2^x+20=15+3^x

The ^ is supose to be a square root sign
Fill in the blanks:

_ _ - ( _ / _ ) =9

the only numbers you can use are 3, 4, 6, 8, and 9

the same goes for this problem:

_ _ / _ + _ _ = 418