This can be solved using the angle bisector theorem. Note that line segment AD is the angle bisector of triangle DAB from angle DAB. Therefore, we know that the ratios 
and 
are equal. Solving, we get 
. Cross multiplying, we get 
, and solving this equation we get 
. 10.2 is your answer.
Twenty-seven is smaller than five times a number increased by seven.
1 answer:
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