exam Maths Puzzle Numerical Ability

please help me solve question{{{6x+4y=100}}} also (2x+6)+3y=15 if y = 10

Thank you!

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exam Other Question

theres a picture of a trianle.
and the question is, find the coordinates of the point where the median from A intersects BC.

A(0,6)
B(-5,0)
C(8,0) The reciprocal of a number plus the reciprocal of three times the number equals 1/3. Find the number.