the ratio of x to y is 7 to 3 and 2x - 3y = 10 then.......
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Suppose that \(\frac{7y-x}{2x+y}=\frac{1}{3}\) then the ratio of x to y is
\(3\left(7y-x\right)=2x+y\Leftrightarrow21y-y=2x+3x\Leftrightarrow20y=5x\Leftrightarrow\frac{x}{y}=\frac{20}{5}=4\)
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if the ratio of 3 sides of a triangle is 2:3:4 then the ratio of 3 heights corresponding to those 3 sides is
Giải:
Gọi 3 cạnh của tam giác là a, b, c và các chiều cao tương ứng là h, k, g \(\left(a,b,c,h,k,g>0\right)\)
Ta có: \(\frac{a}{2}=\frac{b}{3}=\frac{c}{4}\)
\(ah=bk=cg\)
\(\Rightarrow2.\frac{a}{2}.h=3.\frac{b}{3}k=\frac{c}{4}.4.g\)
\(\Rightarrow2h=3k=4g\)
\(\Rightarrow\frac{2h}{12}=\frac{3k}{12}=\frac{4g}{12}\)
\(\Rightarrow\frac{h}{6}=\frac{k}{4}=\frac{g}{3}\)
Vậy 3 chiều cao tương ứng của tam giác tỉ lệ với 6, 4, 3
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if the ratio of 3 sides of a triangle is 2:3:4 then the ratio of 3 heights corresponding to those 3 sides is
if the ratio of 3 sides of a triangle is 2:3:4 then the ratio of 3 heights corresponding to those 3 sides is
Dịch: nếu tỷ lệ 3 cạnh của một tam giác là 2: 3: 4 thì tỷ lệ 3 chiều cao tương ứng với những 3 bên là..........
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if the ratio of 3 sides of a triangle is 2:3:4 then the ratio of 3 heights corresponding to those 3 sides is
if the ratio of 3 sides of a triangle is 2:3:4 then the ratio of 3 heights corresponding to those 3 sides is
If of the figure below is colored then x =
Question 9:
A square of side 8cm has the same perimeter as a rectangle. If the ratio of the width of the rectangle to its length is 1:3 then its area is
Question 10:
The cost of a movie ticket is 5 dollars. The cost for 12 people to each of a movie ticket and a soft drink is 72 dollars. What is the cost of a soft drink?
Answer: dollars
q9.
chu vi hình chữ nhật (hình vuông) là: 8*4=32(cm)
chiều dài hcn là: 32:2:(1+3)*3=12(cm)
chiều rộng hcn là: 32:2-12=4(cm)
dt hcn là:12*4=48(cm2)
đáp số:
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Q9:THE PERIMETER OF THE SQUARE IS ;
8 X 4 = 32 ( CM )
SO , THE PERIMETER OF THE RECTANGLE IS 32 CM .
HALF OF THE RECTANGLE IS :
32 : 2 = 16 ( CM )
THE WIDTH OF THE RECTANGLE IS :
16 : ( 3 + 1 ) X 1 = 4 ( CM )
THE LENGTH OF THE RECTANGLE IS :
4 X 3 = 12 ( CM )
ITS AREA IS :
12 X 4 = 48 ( CM 2)
ANSWER : 48 CM 2
Q10: THE COST FOR 12 PEOPLE TO EACH OF A MOVIE KET IS :
5 X 12 = 60 ( DOLLARS )
THE COST OF A SOFT DRINK IS :
72 - 60 = 12 ( DOLLARS )
ANSWER: 12 DOLLARS
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The ratio of the number of girls to the number of boys in a classroom is 5:4. When 10 girls left the classroom, then ratio of the number of boys to the number of girls became 4:3. How many students were in the classroom at first? Answer: There were ….. students the classroom at first
10 studens :
5-3=2 parts
1 part
10:2=5 studens
that class has
5x9=45 studens
answer:45 studens
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there were 45 students the classroom at first
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there were 45 students the classroom at first
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A factory has male and female workers in the ratio of 3 : 5. Some female workers but no male workers resigned. 5 more workers are then employed. The ratio of male to female workers is now 4 : 3 while the number of female workers is 15. Find possible original numbers of female workers.