exam Maths Puzzle Numerical Ability

y=-2/5 x-18
2x-3y=22

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The instructions are as follows:

Simplify. 7 is outside of the square root and 245 is inside the square root.

Please show the step by step process. Thank you for your help on this one. How many bushels from a mixture that is one third oats must be added to 480 bushels of mixture of corn and oats which is 75% corn in order to get a mixture which will be 30% oats?