book Maths Puzzle Numerical Ability

If 300 jellybeans cost you x dollars. How many jellybeans can you purchase for 50 cents at the same rate?

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book Other Question

Use linear Combinations to solve the system of linear equations.

x+1-3y=0
2x=7-3y

Im having so much trouble solving these types of Problems ! Please help!!! Show me how Solve the system by addition

5x + 9y = -12
x - 2y = 10