Question

Find in last that a+b-c

Answer 1

Answer:

3°

Step-by-step explanation:

In ∠ROS (straight angle), 5b+75°=180°.

∴b=21°

∠POR = ∠QOS (alternative angle).

∴a=84°

In ∠ROS (straight angle), a+2c=180°.

2c=180°-84°

∴c=48°

∴$\frac{84+21-48}{13} =\frac{57}{19}=3$