Friday

September 19, 2014

September 19, 2014

Posted by **simranpreet** on Monday, December 3, 2012 at 6:57am.

- maths -
**Reiny**, Monday, December 3, 2012 at 9:08amThe number of man-hours that were used were

300 + 285 + 270 + 255 + ... + 15 + 0

Since we can't count the + 0 , (nobody worked that day) ,

we need the number of terms of

300+285 + ... + 15

the left side is an AS where a = 300 , d = -15 , n = ?

when the last term is 15

15 = a + d(n-1)

15 = 300 - 15(n-1)

15 = 300-15m + 15

15n = 300

n = 20

- maths -
**Rich**, Thursday, February 27, 2014 at 2:44amReiny's solution just tells us the max number of days not how many days were actually used.

We know that 15 more days were used than originally planned with the full 300.

300d= the sum of the progression

**Answer this Question**

**Related Questions**

airthmetic progression - 300 men wre engaged to complete a job in acertain ...

maths, proportion - twelve men take 6 hours to finish a piece of work. after the...

math - If a job takes 64 men to complete in 15 days, how many more men will take...

math - if 8 men can do a job in days, what is the percentage increase in number ...

math - I 64 men do a job in 15 days how many more men are needed to do the job ...

maths - There were a total of 5214 men,women and children in an exhibition. The ...

arithmetic - Three men are working together can finish a house repair job in 10 ...

work - b)5 men can do equal amount of work as 8 women. If 3 men and 5 women ...

Mathematics - Twelve man take 6 hours to finish a piece of work. After the 12 ...

gr12 math - froma group of 6 ladies and 4 men, determine in how many ways a ...