exam Maths Puzzle Numerical Ability

x+y+z=8.25

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exam Other Question

I just need to know if I've done this right. Bond valuation: 15 yr, $1000 par value pays 8% annual interest. Markep price of the bonds is $,085 and required ror is 10%. What is kindly help me with these problems. please answer these and show the solutions. thank you

1. x/77x-121y - y/49x-77y

2. a/6a-9b - b/4a-6b