exam Maths Puzzle Numerical Ability

one number is 12 more than the other. The larger number is 7 times the smaller number. Find the number.

thank you very much in advance!!!.

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exam Other Question

How do you do polynominals?(using boxes) Derive the identity for tan(a-B)
tan(a-B) = tan[a (-B)].

***** After applying the formula for tan of sum or 2 angels, use the fact that the tan is an odd function