Postal or Sorting Assistants Model Paper 7 With Solutions

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Question : 4 of 100

Marks: +1, -0

Simplify;

{69×69×69-65×65×65}/{69×69 + 69×65+65×65}

1
4
0.216
0.164

Solution:

{69 × 69 × 69 - 65 × 65 ×65}/{69×69 + 69×65 + 65×65}

Using

{a^3-b^3}/{a^2 +ab + b^2}=a-b

∴69-65 = 4

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