exam Maths Puzzle Numerical Ability

I'm having trouble with questions 50 and 58 in chapter 9 section 9.3 and I'm also having trouble with problem 54 in chapter 9 section 9.4. Please help!

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4+2(x-8) A man deposited $6800 into two accounts. One account earns interest at 8% and the other at 10.5%. The total interest for one year is $669. Find the amount deposited in each account.