book Maths Puzzle Numerical Ability

What 7 odd numbers when added together equals 50?

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book Other Question

Help.....
Write equation for each line in the standard form Ax+By=C

1. through (2,3) and (-3,5)
2 through (4,1) with m=-3 The number 3 (five) (written in base five) is equivalent to what symbol in base two.