exam Maths Puzzle Numerical Ability

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

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exam Other Question

Given f(x)=3x+4
Find f -1(x)
x/5 = 9/10 - 1/x