To find the difference, subtract Thea's earnings from Hadley's earnings.

Thea earned $54 more than Hadley.
25 students.....10 of which passed...
percentage of students that passed : 10/25 = 0.4 = 40% <==
If two angles and included side of one triangle are equal to two angles and the included side of the other triangle , then the two triangles are congruent (ASA rule).
in figure
- consider triangle ABD and ACD
- Angle BAD = angle CAD
- AB = AC
- Angle B = angle C
- triangle ABD congruent to Triangle ACD ( by ASA rule)