Answer:
The answer is 7.6.
Step-by-step explanation:
The dimensions are length equal to 9 inches and width equal to 6 inches.
It is given that length of rectangularframe is three less than twice the width and its perimeter is 30 inches.
We have to find out the dimensions of the frame.
What is the perimeter of a rectangle ?
The perimeter of a rectangle is 2 ( b + l ) , where b is width and l is the length of the rectangle.
As per the question ;
Length of rectangularframe is three less than twice the width.
Let's assume width be x.
So ;
Length will be ;
= 2x - 3
We know that ;
Perimeter of a rectangle is given by ;
P = 2 ( b + l )
⇒ 30 = 2 ( x + 2x - 3 )
⇒ 30 = 2 × ( 3x - 3 )
⇒ 30 = 6x - 6
⇒ 6x = 36
⇒ x = 6 inches
So ;
width will be 6 inches and length will be ;
l = 2x - 3
l = 2 × 6 - 3
l = 12 - 3
length = 9 inches
Thus , the dimensions are length equal to 9 inches and width equal to 6 inches.
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Answer:
The number of blue marbles be 3.
Step-by-step explanation:
As given
A drawer has some red ,green and blue marbles.
There are 33 marbles .
there are 4 times as many red marbles as green marbles.
Let us assume that the number of green marbles be g .
Than Red marbles = 4g
There are half as many blue marbles as green marbles.
Than
Than the equation becomes
Than simplify the above
g = 6
Number of blue marbles = 3
Therefore the number of blue marbles be 3 .