1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
worty [1.4K]
3 years ago
11

at a country concerts the ratio of the number of boys to the number of girls 2 to 7.if there are 250 more girls than boys how ma

ny boys are at the concerts.
Mathematics
1 answer:
ryzh [129]3 years ago
7 0
Let B be the number of boys and G= number of girls:

B/G = 2/7 (given)

And

G= 250+B (given), then

B/G = B/(250+B) = 2/7

B/(250+B) = 2/7 → Cross multiplication:

7.B = 2(250+B) → 7.B = 500 + 2.B

5.B = 500  And B = 500/5   And B = 100

Boys = 100  and Girls = 350

Proof: 100/350 = 10/35 = 2/7
You might be interested in
The angles in a triangle are in the ratio 1:2:3. Show that this triangle is a right-angled triangle. The hypotenuse of the trian
natita [175]

Answer:

see explanation

Step-by-step explanation:

(a)

Sum the parts of the ratio , 1 + 2 + 3 = 6 parts

Divide sum of angles in a triangle by 6 to find the value of one part of the ratio.

180° ÷ 6 = 30° ← value of 1 part of the ratio

2 parts = 2 × 30° = 60°

3 parts = 3 × 30° = 90°

Since there is an angle of 90° then the triangle is right.

(b)

The shortest side is the side opposite the smallest angle of 30°

Using the sine ratio and the exact value

sin30° = \frac{1}{2} , then

sin30° = \frac{opp}{hyp} = \frac{opp}{19} = \frac{1}{2} ( cross- multiply )

2 opp = 19 ( divide both sides by 2 )

opp = 9,5

Shortest side in the triangle is 9.5 cm

6 0
3 years ago
Question 15 I mark as brainliest ​
Nesterboy [21]
If imma be honest I don’t understand that
7 0
3 years ago
A train traveled 399 miles in 7 hours. Find the trains speed.
Andrews [41]

Answer:

57 mph

Step-by-step explanation:

were tryin to find its speed in the terms of mph which is miles per hour, so we need to find out how many miles it goes in a hour, so we divide 399 mph by 7 hours to get 57 mph.

8 0
3 years ago
Read 2 more answers
It took Sharon 105 minutes to wash three cars and put everything away. If she spent 10
shtirl [24]
Well that would be 105 - 10. If you spent 105 minutes in total and 10 of that was putting your stuff away, take that 10 minutes away and you’d get 95. So, she spent 95 minutes washing 3 cars in total. If you divide that 95 into 3s, you get rounded 31 minutes each.
3 0
3 years ago
a 12-ft-long ladder is leaning against a building. the ladder makes a 45 degree angle with the building. how far up the building
zhuklara [117]
12 cos45degree=8.486 ft
6 0
2 years ago
Other questions:
  • What is the coefficient of the variable in the expression 4 − 3x − 7 + 6? (3 points)
    13·2 answers
  • ********HELP WITH THE PROBLEM IN THE PICTURE*********
    10·1 answer
  • 2y+8x=1 in slope intercept form
    7·1 answer
  • A triangle has one side measuring 13 millimeters and two sides measuring 11 millimeters. Is this triangle scalene?
    15·2 answers
  • Describe the transformation of the graph of f into the graph of g as either a horizontal or vertical stretch. f(x)=sqrt(x) and g
    7·2 answers
  • Kelly's bill at a restaurant came to $21.52. If
    5·1 answer
  • X-intercept = -3, y-intercept = 4<br><br>A, B, C, or D​
    10·1 answer
  • Match the following equation to the correct situation.
    15·1 answer
  • What is the answer for this problem?
    11·1 answer
  • The scale model of a building is 8.5 inches tall. How tall is the actual building if the scale
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!