exam Maths Puzzle Numerical Ability

Please help me:

1. Joe has a collection of nickels and dimes that is worth $5.65. If the number of dimes were doubles and the number of nickels were increased by 8, the value o

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Can someone help me on this problem?

I need t solve the system by addition:

x + y = 6
x - y = 4

Thank you,
Lisa Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and proportion to complete the following table.
Hat Size
7 1/2 r