Explanation

Let's start by calling the two numbers we are looking for x and y.

x + y = 80

x - y = 20

x - y = 20

x = 20 + y

x + y = 80

20 + y + y = 80

20 + 2y = 80

2y = 60

y = 30

x + y = 80

x + 30 = 80

X = 50

Sum: 50 + 30 = 80

Difference: 50 - 30 = 20

Explanation

Let the number be x
According to the question,
91 - 

 = x
9100 - 30x = 100x
Or, 9100 = 130x
Or, x = 

Hence, x = 70

Explanation

If the sum of the digits of a number is divisible by 3, then the number is also divisible by 3.

Here, 9+9+6=24 is multiple of 3.

So, 996 is the largest number divisible by 3

ND5-07-2023

Explanation

A+B+C=395

B=A+25%(A) (or) C+20%(C)/ 

B=1.25A (or) 1.2C

subs one condition at a time 

2.25A+C=395 ................. eq 1 

A+2.2C=395...................... eq 2 

multiply eq 2 by 2.25 and subtracting with eq 1 

2.25A+C=395

2.25A+4.95C=888.75

−3.95C=−493.75

C=125

B=1.2(C)=1.2(125)=150

A=395−150−125=120

A=120

Explanation

15 men complete the work in 8 days

Total work = 15 men * 8 days = 120 man-days

Now, to complete the work in 10 days:

120 man-days / 10 days = 12 men

Explanation

Q. What subject will start the series of lectures?

Ans: Algebra

Q. Which of the following day is a holiday?

Ans: Wednesday

On which day lecture of Geometry is scheduled?

Ans: Monday

How many days after Physics is Biology?

Ans: 1 day

Explanation

K is 40 m south is west of L. If m is 40 m south east of L. Then m is in which direction of k

Explanation

Let's solve:

3 men = 6 boys (given)

1 man = 2 boys

Work done by 3 men or 6 boys in 20 days:

Let's calculate work done by 1 boy in 1 day:

6 boys * 20 days = 120 boy-days

Now, 6 men and 8 boys:

6 men = 6 * 2 = 12 boys

Total = 12 boys + 8 boys = 20 boys

Time taken = 120 boy-days / 20 boys = 6 days

Explanation

To solve this problem, calculate the total hours worked by the men:

12 men × 8 hours/day × 10 days = 960 hours

Now, find the number of men needed to complete the work in 5 days, working 12 hours a day:

Let x be the number of men.

x men × 12 hours/day × 5 days = 960 hours

x × 60 = 960

x = 16

Explanation

If the smaller field is 5 acres, then the larger field is twice that size, which would be

$2\times 5=10$ acres. To find the total area of both fields, you simply add the sizes of both fields together:

$\text{Total area}=\text{Size of smaller field}+\text{Size of larger field}$ $\text{Total area}=5\text{acres}+10\text{acres}$