All categories

3 years ago

The number of boys and girls in a class are in the ratio 5:4. If the

Mathematics

1 answer:

vichka [17]3 years ago

3 0

Answer:

no.of boys is 45

Step-by-step explanation:

here, let the number of boys and girls be 5x and4x

ATQ,

5x=4x+9

or,5x-4x=9

or,x=9

then, the number of boys is 9×5=45

and the number of girls is 9×4=36..

You might be interested in

(-6,8); perpendicular to y = -3/2x -1

UNO [17]

Answer:

$y = \frac{2}{3} x + 12$

Step-by-step explanation:

$y = - \frac{3}{2} x - 1$

The gradient of a line is the coefficient of x when the equation of the line is written in the form of y=mx+c.

Thus, gradient of given line= $- \frac{3}{2}$ .

The product of the gradients of perpendicular lines is -1.

(Gradient of line)(-3/2)= -1

Gradient of line

$- 1 \div ( - \frac{3}{2} ) \\ = - 1( - \frac{2}{3} ) \\ = \frac{2}{3}$

Substitute m= $\frac{2}{3}$ into y=mx+c:

$y = \frac{2}{3} x + c$

To find the value of c, substitute a pair of coordinates.

When x= -6, y= 8,

$8 = \frac{2}{3} ( - 6) + c \\ \\ 8 = - 4 + c \\ c = 8 + 4 \\ c = 12$

Thus, the equation of the line is $y = \frac{2}{3} x + 12$ .

7 0

3 years ago

(-6 - 4) : (-5) = ? What is the answer to this plz help

Nesterboy [21]

Answer:

-10 not sure what : is

Step-by-step explanation:

6 0

3 years ago

A chef needs to choose a pan that will allow food to cook as quickly as possible for a special recipe and has decided that he wi

raketka [301]

Answer:

234

Step-by-step explanation:

3 0

3 years ago

Winona asked randomly selected students in

MA_775_DIABLO [31]

Sample space=S=240
N=75
Y=165

$\\ \sf\longmapsto P(N)=\dfrac{75}{240}=\dfrac{25}{48}\approx 2$

$\\ \sf\longmapsto P(Y)=\dfrac{165}{240}$

$\\ \sf\longmapsto P(Y)=\dfrac{33}{48}$

$\\ \sf\longmapsto P(Y)=\dfrac{11}{16}$

3 0

2 years ago

If the walls are 9' high, how much paint would I need to buy to paint the walls of all three bedrooms?

ludmilkaskok [199]

Answer:

The required paint for a total of $1.404\ ft^{2}$ is approximate 6 gallons

Step-by-step explanation:

we know that

To find how much paint would I need to buy to paint the walls of all three bedrooms, calculate the area of all three bedrooms

Master Bedroom

The area is equal to

$A1=(16+16+12+2+18)*9=576\ ft^{2}$

2 Bedroom

The area is equal to

$A2=(12+14+10+10)*9=414\ ft^{2}$

3 Bedroom

The area is equal to

$A3=(10+10+14+10+2)*9=414\ ft^{2}$

The total area is equal to

A=A1+A2+A3

$A=576+414+414=1.404\ ft^{2}$

Approximate one gallon of paint covers 250 square feet

$1.404/250=5.6\ gal$

7 0

4 years ago