From 15 to 27 what is the percentage increase ?

66.66666667 percent

Step-by-step explanation:

In this case we have a positive change (increase) of 66.66666667 percent because the new value is greater than the old value. Using this tool you can find the percent increase for any value.

1 supplementary angles equal 180 degrees.

Make an equation and solve:

X + x + 22.8 = 180

2x = 157.2

X = 157.2/2

X = 78.6

One angle is 78.6 degrees

The other angle is 101.4 degrees