Answer:
In a class of 28 students the ratio of girls and boys is 4:3. The number of girls in the class is 16.
Solution:
Let us consider total number of students in the class is “T”.
Let the ratio of the students (Girl and boys) in the class is G: B.
Given that total number of students in class (T) = 28
From question, given that ratio of girls and boys is 4:3. We can write this ratio as,
Number of girls (G) = 4x and number of boys (B) = 3x
We have to find the number of girls in class. The total number of girls present in the class is given as ,
The total girl students present in the class G =
=
Hence the total number of girls in the class is 16.
Step-by-step explanation:
x+y=25
x=2y+7
x+y=25
(2y+7)+y=25
3y+7=25
-7. -7
3y=18
÷3. ÷3
y=6
x=19
19 and 6
Total amount of lunch money left ($) 100 75 50 25
Which equation, in standard form, represents the relationship between the number of lunches, x, and the amount of lunch money Aaron will have left, y?
x + 5y = 100
100x + y = 5
x + 100y = 5
5x + y = 100
Answer:
its D
Step-by-step explanation:
The size of angle x is 99 degree
The exterior angle theorem states that the measure of an exterior angle is equal to the sum of the measures of the two remote interior angles of the triangle. straight angle: an angle whose sides lie in opposite directions from the vertex in the same straight line and which equals two right angles.
We have,
∠CDE =
∠BCD =
∠ABC =
According to the question
Angle Addition Postulate and definition of straight angle:
∠BDC+∠CDE =
Substitute into : ∠BDC + = ∠BDC = - ∠BDC =
Exterior Angle Theorem:
∠BDC + ∠BCD = ∠ABC
Substitute into :
+
=
=
hence, the size of angle x is 99 degree
Learn more about exterior angle theorem from here
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Answer:
50
Step-by-step explanation:
42+123=165
165+50=215
215+145=360