Two complementary angles make a total of 90, so 3x+6x=90, x=10
Answer:
6
Step-by-step explanation:
Let the event 
The the probability of the events


The conditional probability

Solution:
we are given in the problem that
So far, 18 of the 25 students in your class have turned in field trip permission slips.
we have been asked to find
What percent of your classmates have turned in permission slips?
Required Percentage
Simplify we get
Required Percentage
Hence 72% percent of your classmates have turned in permission slips.
Let her earning be x
The volume of 1 pitcher in millilitres = 1.5 x 1000 = 1500 ml [1 liter is 1000 milliliter]
3 pitchers = 1500 x 3 = 4500 ml
100 ml = 0.38 rs.
4500 ml = 0.38 x 4500= 1690 rs.