book Maths Puzzle Numerical Ability

i am very confused on this whole thing!! LoL im in the 8th grade at MSMS and im confused!!help me=)

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2x+4y=6x-10y for sale cost
chicken 1 £1
birds 1 £5
parot 1 5p
e. i,ve got £100 i need to buy one of them each.but the question is on £100 puonds i should buy £100 o