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3 years ago

A class comprises 10 students. How many different ways can the students' desks be arranged in a row

Mathematics

1 answer:

labwork [276]3 years ago

4 0

Step-by-step explanation:

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In a particular month, Ezhil spent one-fifth of her salary on shopping. Two-fifth of the remaining she gave to her sister. If sh

Oxana [17]

Answer:

$Salary = Rs23000$

Step-by-step explanation:

Given

$Shopping = \frac{1}{5}$

$Sister = \frac{2}{5}R$

$Left over = Rs11,040$

Required

Her salary in that month

Given that she spent $\frac{1}{5}$ of her salary on shopping, this implies that she has $\frac{4}{5}$ of her salary left

From what's left, she gave her sister $\frac{2}{5}$

This means she gave her sister $\frac{2}{5} * \frac{4}{5}$

Sister = $\frac{8}{25}$

Calculating a fraction of what's left

$Left over = 1 -Shopping - Sister$

$Left over = 1 - \frac{1}{5}- \frac{8}{25}$

$Left over = \frac{25 - 5 - 8}{25}$

$Left over = \frac{12}{25}$

Recall that she has Rs11,040

This means that

$\frac{12}{25} of Salary = Rs11,040$

Multiply both sides by $\frac{25}{12}$

$\frac{12}{25} * \frac{25}{12} * Salary = Rs11,040 * \frac{25}{12}$

$Salary = Rs11,040 * \frac{25}{12}$

$Salary = \frac{Rs276000}{12}$

$Salary = Rs23000$

Hence, her salary for that month was Rs23000

5 0

3 years ago

Read 2 more answers

What is the sum of the measures of the interior angles of a decagon?

Dafna11 [192]

Answer:

1,440 degrees (10 interior angles of 144 degrees)

Step-by-step explanation:

4 0

3 years ago

Can someone help me expand this in log: log_3 x^2 yz and the picture above

BigorU [14]

Answer:

$log_4(\frac{xy}{3})=log_4(x) + log_4 (y) - log_4 (3)$

Step-by-step explanation:

using the properties of logarithms, the log of a product gives the addition of logs, and the log of a quotient gives the subtraction of logs;

$log_4(\frac{xy}{3})=log_4(x) + log_4 (y) - log_4 (3)$

7 0

3 years ago

The height of an object is directly proportional to the length of its shadow a tree that is 2.5 meters tall cast a shadow 5 mete

alisha [4.7K]

Answer:

The height of the building that casts a shadow of 78m meters is 39m

Step-by-step explanation:

Let height be represented by H and the shadow is S

as they are directly proportional

H $\alpha$ s

H=KS ( where K is a proportionality constant)

H=2.5m , S= 5m

On substituting in the equation

2.5 = K*5

K= 0.5

Now the equation becomes

H = 0.5*S

Height when shadow is 78m

H= 0.5*78

H= 39m

7 0

3 years ago

Find the slope: (0,5) and (1,2)

Lapatulllka [165]

Answer: wym and need more info like a pic or so

Step-by-step explanation:

7 0

3 years ago