exam Maths Puzzle Numerical Ability

Solve the equation

5m-8=57

thanks yall

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exam Other Question

You cannot change the order of the numbers but you may put two numbers to gether to form a two digit number. You must observe the order of operations.
1 2 3 4 5 6 7 8 9 =90

Th Laura invested $2000, some at 8%,annual simple interestand the rest at 10% annual simple interest, giving her a total of $176 per year. How much did she invest at 8%?