<span>Information is given(reasons are in the parenthesis)
Angle A and angle B are supplementary. Angle B and Angle C are supplementary (given)
DC is parallel to AB (consecutive interior angles are supplementary )
BC is parallel to AD (consecutive interior angles are supplementary)
ABCD is a parallelogram (definition of parallelogram, has to pairs of parallel sides)</span>
k = 10
Using trigonometric ratio then;
sin30 = opp/hyp
0.5 = 5/k
cross multiply
0.5k = 5
Divide both sides by 0.5
k = 5/0.5
k=10
Grandchildren get 25,000 and child gets
50.000