exam Maths Puzzle Numerical Ability

3/5m+a=b, for m

please help, i have no i dea how 2 do these with fractions

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exam Other Question

1st sum of money at 6%
2nd sum of money is twice the first sum + $1000 at 10% and the total annual income is $620..

how much is invested at each rate and how did you get it.. this has to be done in the i=prt form The sum of two counting numbers is 91. Half of one number equals three times the other number. What are the number?