exam Maths Puzzle Numerical Ability

how do i solve this problem?
27x3 - 13x

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exam Other Question

Parallelogram ABCD is divided by a diagonal into two congruent triangles. Angle DCA and BAC have equal measures of 60 degrees and are complementary. Find the measure of :

Angle DCA, DAC, CAB, ABC, BCA, AND BCD what would I do for this problem? (s^4t)^3*(s^4t^3)^2