Question

3. If 36 men can finish a piece of work in 25 days, how many days will 15
men take to do it?
4. Find:
a) 30% of 700 b) 95% of 95
5. Find Simple interest:
Principal = Rs.4000, Rate per annum = 15%, Time = 2years
6. If 25% of a journey is 750 km, how long is the whole journey?
7. If 30% of a sum of money is Rs 270, what is the total sum of money?​

Answer 1

Answer:

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Step-by-step explanation:

3. Given, 36 men can finish a piece of work in 25 days

=> The number of man-days = 36*25 = 900

Let x be the number of days taken by the 15 men to do the piece of work

=> The number of man-days = 15x

But the number of man-days remains constant.

=> 15x = 900

x = 900/15 = 60

=> 15 men take 60 days to complete the piece of work

.

5. simple interest formula: 4000 × 8 × 5/100 = Rs. 1600

6. 25% of x = 750

x * 25/10 = 750 km

x = 750 x 100/25

x = 3000 km

30% of sum of money is rupees 270

then 1% = 270/30

=9

then 9×100=900 rupees.

Answer 2

Step-by-step explanation:

36 men can finish a piece of work in 25 days.

no. of man-days =36×25=900

let the x be the no. of days taken by the 15 men to do a work.

no. of man-days =15x

no. of man -days remains constant

15x =900

x=900/15=60

then, 15 men take 60 days to complete the piece of work.