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

A sample of 25 electric motors is taken from a large lot. The average current drawn by each motor at rated speed and RPM is 7.65 amps. The standard deviation of the sample is 0.1 how do i solve this problem?
27x3 - 13x