Explanation

If 12 men can complete the work in 24 days,

it means that the total number of man-days required to complete the work is:

12 men * 24 days = 288 man-days.

288 man-days / 8 men = 36 days.

Explanation

Explanation

Amount of work done by A and B in 1 day = 1/30

Amount of work done by A and B in 20 days = 20 × (1/30) = 20/30 = 2/3

Remaining work – 1 – 2/3 = 1/3

A completes 1/3 work in 20 days

Amount of work A can do in 1 day = (1/3)/20 = 1/60

=> A can complete the work in 60 days

Explanation

The average is the sum divided by the number of quantities:

Average = Sum / n

115 = 1840 / n

To find 'n', multiply both sides by 'n' and then divide by 115:

n = 1840 / 115

n = 16

Explanation

Let man required =X

More men, less men (indirect proportion)

M= 15x10/3

M= 150/3

M= 50

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ND19-1-2023

Explanation

Discount price=Market price(1-discount price/100)

70=x(1-20/100)

70=x(1-1/5)

70=x(4-1/5)

(70)(5)=4x

350=4x

x=350/4

x=87.5

SH18-8-2023

Explanation

The sum of all odd numbers between 1 and 100 is 50^2=2500

The sum of all even numbers between 2 and 100 is 50^2+50=2550

The total of 1 to 100 natural numbers is 2500+2550

5050

The average of the first 100 numbers is 5050 / 100 = 50.50

Explanation

Explanation

Mean =  numbers of multiples/ sum of multiples of first five of 3

The average of the first five multiples of 3

= 3 + 6 +9 + 12 + 15 / 5

= 45/ 5

= 9

Explanation

The sum of five numbers is 555.

The average of the first two numbers is 75, so their sum is 2 x 75 = 150.

The third number is 115.

So, the sum of the first three numbers is 150 + 115 = 265.

Since the sum of all five numbers is 555, the sum of the last two numbers is 555 - 265 = 290.

Therefore, the average of the last two numbers is 290 / 2 = 145.

The correct answer is: 145