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3 years ago

the ages of hari and harry are in the ratio 5:7 four years from now the ratio of their ages will be 3:4. find their present ages

Mathematics

2 answers:

Rainbow [258]3 years ago

4 0

Answer:

x = 20

y = 28

Step-by-step explanation:

hari's age: x

harry's age: y

7x = 5y

4(x+4) = 3(y+4)

4x+16 = 3y+12

4x+4 = 3y

5/3(4x+4) = 5y = 7x

20/3x +20/3 = 7x

20/3 = 1/3x

x = 20

y = 28

saveliy_v [14]3 years ago

4 0

Answer:

10 y 8 años

Step-by-step explanation:

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Which of the following shows √-25 simplified and written as a complex number?

geniusboy [140]

Answer:

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Step-by-step explanation:

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3 years ago

Calculate the second moment of area of a 4-in-diameter shaft about the x-x and yy axes, as shown.

Keith_Richards [23]

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6 0

3 years ago

1) Eliot and William went hiking. They went at the same speed. Eliot's hike was 8 miles, and William's hike was 12 miles. It too

Vitek1552 [10]

Answer:

1) 2 hours

2) 96 miles

Step-by-step explanation:

1) Eliot and William went hiking. They went at the same speed. Let x mph be their speed.

Elliot:

Distance = 8 miles

Speed = x mph

Time $=\dfrac{8}{x}$ hours

William:

Distance = 12 miles

Speed = x mph

Time $=\dfrac{12}{x}$ hours

It took Eliot $40\ min=\dfrac{40}{60}\ hour=\dfrac{2}{3}\ hour$ less than William, then

$\dfrac{8}{x}+\dfrac{2}{3}=\dfrac{12}{x}\\ \\\dfrac{2}{3}=\dfrac{12}{x}-\dfrac{8}{x}\\ \\\dfrac{2}{3}=\dfrac{4}{x}\\ \\2x=3\cdot 4\ \ [\text{Cross multiply}]\\ \\2x=12\\ \\x=6\ mph$

So, William's hike was

$\dfrac{12}{6}=2$

hours long.

2) Initially:

Distance = 120 miles

Speed = 55 mph

Time $=\dfrac{120}{55}=2\dfrac{10}{55}=2\dfrac{2}{11}\$ hours

Final:

Speed = 44 mph

Time $=2\dfrac{2}{11}$ hours

Distance $=44\cdot 2\dfrac{2}{11}=44\cdot \dfrac{24}{11}=4\cdot 24=96\ miles$

8 0

3 years ago

11 and 12 please explain on 12

Fiesta28 [93]

12. since the straws are 4 inches long and she wants to cut them into 1/2 in you would get eight 1/2 pieces on that one straw but since she has two straws she has sixteen 1/2 pieces so no she does not have enough to cut twenty 1/2 pieces

6 0

3 years ago

Read 2 more answers

The minimum and maximum temperature for a day in Cupcake Town can be modeled by the equation below: 3|x − 8| + 15 = 18 What are

Anit [1.1K]

3|x − 8| =18 - 15 = 3
|x − 8| = 3/3 = 1
x − 8 = $\pm1$
x = $\pm1$ + 8
x = 1 + 8 or x = -1 + 8
x = 9 or x = 7
i.e. minimum temperature is 7 while the maximum temperature is 9

6 0

3 years ago