book Maths Puzzle Numerical Ability

Marco has 150 coins, all nickels and dimes. He has 12 more dimes than nickels. How many nickels and how many dimes does he have?

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book Other Question

Solve the inequality:

(4/3)(x+1)≤(1/2)(x-3) 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?