exam Maths Puzzle Numerical Ability

Find the sum or difference. - 11/12 - -7/15

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exam Other Question

if you have 21 ballons and you and a partner can both pop 1 or 2 ballons a turn
Haw can you win every time by poping the last ballon Solve by the substitution method.
3x + 4y = 20
-6x + y = 32
Will someone please help me with this one.