exam Maths Puzzle Numerical Ability

1.) 25cg = mg

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exam Other Question

In triangle RST, U lies of TS with TU:US = 2:3. M is the midpoint of RU. TM intersects RS in V. Find the ratio RV:RS. Can you please help?
Solve the system by substitution or elimination
a)....2/x+3/y=16
-1/x+2/y=6

b)....solve for x
|x...3..|
|2...x+1| }all = DET 16

c)...x^2+y^2=7