book Maths Puzzle Numerical Ability

How do you simplify an expression such as 3.6 + (-1.7)

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RE: BODMAS!!!

I have been given the numbers 3,3,5,7 and asked to use BODMAS to come to the answer 24. I have tried and tried but can not get the answer 24. Can anyone help me??
1) Find a number such that 6 more than one-half the number is two-thirds the number