ivumar:
Nice... You assumed the lower row to be that of frequency, right?

NisforNicky:


pls can you find the interquartile range

cc ivumar femi4

NisforNicky:
cc femi4

now, this one below is from the recently concluded SPDC

mete3

jpawjpaw:

a man and a woman can do a work for days.

x + y = 4 (man = x and woman = y)
while the woman alone can do the work for 6 days.
y = 6.
how long will it take the man to do the work?
if x+y = 4
when y = 6
x + 6 = 4
x = 4-6
x = -2
by ignoring the sign,
x = 2//
so it will take the man 2days to do the work.

abeg I stand to be corrected.
the question carry weight

jpawjpaw:

a man and a woman can do a work for days.

x + y = 4 (man = x and woman = y)
while the woman alone can do the work for 6 days.
y = 6.
how long will it take the man to do the work?
if x+y = 4
when y = 6
x + 6 = 4
x = 4-6
x = -2
by ignoring the sign,
x = 2//
so it will take the man 2days to do the work.

abeg I stand to be corrected.
the question carry weight

jpawjpaw:

a man and a woman can do a work for 4 days.

x + y = 4 (man = x and woman = y)
while the woman alone can do the work for 6 days.
y = 6.
how long will it take the man to do the work?
if x+y = 4
when y = 6
x + 6 = 4
x = 4-6
x = -2
by ignoring the sign,
x = 2//
so it will take the man 2days to do the work.

abeg I stand to be corrected.
the question carry weight

NisforNicky:


hmmmm........
this is what I did too

ivumar femi4 pls confirm

NisforNicky:


Finally


Cc thankGod001

NisforNicky:
cc femi4

now, this one below is from the recently concluded SPDC

mete3

femi4:
Can't you see that laugh emoji at the end of his solutions. As you can see, some of the question were either incorrect or answer missing from the options

Besides, you can't finish a job working alone in lesser days than the no of days both of them will use to complete same job.

SPLENDID25:
yes Sir

NisforNicky:


hmmmm........
this is what I did too

ivumar femi4 pls confirm

ivumar:


Wrong Sir

femi4:
Can't you see that laugh emoji at the end of his solutions. As you can see, some of the question were either incorrect or answer missing from the options

Besides, you can't finish a job working alone in lesser days than the no of days both of them will use to complete same job.

NisforNicky:


alright
pls

A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

A. 40 days

B. 23 days

C. 37 ½ days

D. 37 days


cc femi4

NisforNicky:


A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work in

A.18 days
B.6 days
C. 4 days
D. 8 days

cc ivumar

I got 8

femi4:
A does 80% of job in 20 Days. Hence, 100% of job in (100/80) x 20 = 25 Days

A alone can complete the job in one day (1/25) portion

A and B do 20% of job in 3 Days. Hence, 100% of job in (100/20) x 3 = 15 Days

A and B can complete the job in one day (1/15) portion

B alone can complete the job in one day

[(1/15) - (1/25)] = [(5- 3 )/75] = [2/75] portion

B alone can complete the job = (75/2) = 37.5 Days

femi4:
4days
2A = B Hence, A = 12/2 = 6days
Working together 1/6 + 1/12 = 1/4 of the job/day
Hence, the job will be completed in 4days by A and B working together

femi4:
A does 80% of job in 20 Days. Hence, 100% of job in (100/80) x 20 = 25 Days

A alone can complete the job in one day (1/25) portion

A and B do 20% of job in 3 Days. Hence, 100% of job in (100/20) x 3 = 15 Days

A and B can complete the job in one day (1/15) portion

B alone can complete the job in one day

[(1/15) - (1/25)] = [(5- 3 )/75] = [2/75] portion

B alone can complete the job = (75/2) = 37.5 Days

NisforNicky:



1. A alone can do a piece of work in 10 days and B alone can do it in 15 days. In how many days will A and B together do the same work?
(a) 5
(b) 6
(c) 8
(d) 9

2. It takes 6 men 10 days to paint 2 rooms. How long will it take 4 men to paint 6 rooms?

A. 42
B. 45
C. 62
D. None of the options

cc ivum ar fe mi4

NisforNicky:



1. A alone can do a piece of work in 10 days and B alone can do it in 15 days. In how many days will A and B together do the same work?
(a) 5
(b) 6
(c) 8
(d) 9

2. It takes 6 men 10 days to paint 2 rooms. How long will it take 4 men to paint 6 rooms?

A. 42
B. 45
C. 62
D. None of the options

cc ivumar femi4

femi4:
1. 1/15 + 1/10 = 25/150
= 1/6 of the job/day

Hence, working together will take them 6days to complete the job



2. 4men will paint 2 rooms in 6*10/4 = 15days

Hence, painting of 6 rooms by 4 men = 15*3 =45days

Xandre:
BB

Yes to your question on Jim Ovia

femi4:
1. 1/15 + 1/10 = 25/150
= 1/6 of the job/day

Hence, working together will take them 6days to complete the job



2. 4men will paint 2 rooms in 6*10/4 = 15days

Hence, painting of 6 rooms by 4 men = 15*3 =45days

ThankGod001:
SPDC when was that?

NisforNicky:
pls can u show full workings


7. Smith and Thomas can do a piece of work in 72 days; Thomas and Clark can do it in 120 days; Smith and Clark can do it in 90 days. In what time can Smith, Thomas and Clark do it, working together?
(a) 60 days
(b) 66 days
(c) 75 days
(d) 80 days


I got A. 60

NisforNicky:



7. Smith and Thomas can do a piece of work in 72 days; Thomas and Clark can do it in 120 days; Smith and Clark can do it in 90 days. In what time can Smith, Thomas and Clark do it, working together?
(a) 60 days
(b) 66 days
(c) 75 days
(d) 80 days


I got A. 60