exam Maths Puzzle Numerical Ability

Suppose the system vector Ax = 0 has 50 unknowns and its solution space is spanned by 15 linearly independent vectors.

1. What is the nullity of A?
2. What is the rank of A?

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where is the solution ?
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exam Other Question

solve for a: p=a+b+c A merchant wishes to mix candy worth $5 per lb with 40lb of candy worth $2 per pound to get a mixture that can be sold for $3 per lb. How many pounds of $5 candy should be used?