book Maths Puzzle Numerical Ability

Please help solve this problem thanks-

Solve each system by the addition method

Nickels and Dimes. Winborne has 35 coins cinsisting of dimes and nickels. If the value of his coins is $3.30, then how many of each type does he have?

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book Other Question

clear fractions and decimals, solve and check
1/2+4m=3m-5/2

i am really stuck on how to solve it properly the denominater 2 is under the 1 and the denominater 2 is under the 5 I do not understand distributive property at all. I really need help with it but i cant seem to get it. None of my friends understand either. Please help me with it. I need to understand distributive property to pass math. Thank You