exam Maths Puzzle Numerical Ability

6. 20x + 3y= 20
-20x + 5y= 60

9. 3x - 10y= -25
4x + 40y= 20

10. 7x + 15y= 32
x - 3y= 20

11. x - 8y= 18
-16 + 16y= -8

12. 24x + 2y= 52
6x - 3y= -36

13. 88x - 5y

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exam Other Question

The head of a tropical fish is 1/3 as long as its midsection. Its tail is as long as its head and midsection combined. The total length of the fish is 48cm. How long is the tail of This is a problem that I need to solve by system of elimination and then check the answer. The problem is:
{3a+2b=2}
{a+6b+18}
How do I solve this, and check the problem. Please help.

Thank You