book Maths Puzzle Numerical Ability

A telescope is on sale of $250 after markdown of 20% off the regular price. Find the regular price.

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book Other Question

add the x and y intercepts in 3x+5y=12 I am a distance learner and I am having difficulty with an equation that my book does not give examples of. The equation reads:

X/2 + 2y =9
2x-y = 18

How do I solve this type of equation? Please help.