exam Maths Puzzle Numerical Ability

how do i work the answer out to this question :[ ] - -3 = -6

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exam Other Question

For each situation, find the value of x and the measure of the indicated angles
angle PXR appears to be 55 degrees
angle RXT appears to be 125 degrees
M(anglesign)PXR=3x,m(angle solve.
two planes travel toward each other from cities that are 780km apart at rates of 190 km/h and 200km/h. They started at the same. In how many hours will they meet?