book Maths Puzzle Numerical Ability

solve

4a-5b-c=-26
5a+b+2c=-5
2a+4b+c=6

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book Other Question

x varies directly as the square of s, and inversely as t. How does x change when s is doubled? When both s and t are doubled, how does x change? Please simplify this expression:
1/(6^(-1/3) + 5^(-13))