exam Maths Puzzle Numerical Ability

s^2-13s+42=0

a^2+2a-35=0

v^2-15v+54

v^2+12v+27=0

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exam Other Question

find five consecutive odd integers such that the sum of the first and the fifth is one less than three times the fourth.

i need help understanding consecutive numbers..please.
THanks!
5Y-4(2Y+1)<2(0.5-2Y)