exam Maths Puzzle Numerical Ability

Solve

3/8x - 1/2y = 1
0.2x + 0.6y = 4

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exam Other Question

how would i do this? Indicate the formula for the following conditions
C(n,r)=
Factor

10x^2y^5z-5x^5y^2z^5-10x^4y^4z^4