book Maths Puzzle Numerical Ability

i do not understand how to find d in this equation

d/4 + d/6 =5

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book Other Question

find factors of 49y^2-16 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