book Maths Puzzle Numerical Ability

Mr. Merrill has 3 times as many nickels as dimes. The coins have a total value of $1.50. How many of each coin does he have? __nickels __dimes
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book Other Question
What is the point- slope form of an equation with the slope 3/5 that passes through the point (10,-2)? Please help me? Find a basis for the subspace R^4 consisting of all vactors of the form (a + b, b+c, a-b-2c, b + c), what is the dimesion of the subspace?