Q&A - PSLE Math

[S-H]

Hi Can someone help me with the following question, thank you!

5 men are hired to complete a job. If one more man is hired, the job can be completed 8 days earlier. Assuming that all the men work at the same rate, how many more men should be hired so that the job can be completed 28 days earlier?

Let the amount of work 1 man does in 1 day be U.
Amount of work 5 men does in 1 day = 5U
Amount of work 6 men does in 1 day = 6U

Let the no. days required by 5 men to complete the job be D

Amount of work required to complete the job = 5U x D

5U x D = 6U x (D - 8)
5UD = 6UD - 48U
48U = UD
48 = D

No. of days required by 5 men to complete the job = 48 days
Amount of work required to complete the job = 48 x 5U = 240U

To complete the job 28 days earlier = completing the job in 48 - 28 = 20 days

240U / 20 = 12U

No. of men required to complete the job in 20 days is 12
Therefore 12 - 5 = 7 more men should be hired to complete the job 28 days earlier.

Hi pirate,

Thank you for your help!

[StillThinking]

Does anyone realise the questions here mostly all can be solved by very simple algebra?

[ozora]

Could someone help in this question?
Thanks

[nicnac]

Could someone help in this question?
Thanks

[ozora]

Could someone help in this question?
Thanks

Thanks appreciate it

[doraemo]

hi , please help :

Maggie had some money at first . She spent t all in 3 stores. In each store, she spent $2 more than half of what she had when she entered.
a) How much did she spend at the last store?
b) How much did she have at first?

[tianzhu]

hi , please help :

Maggie had some money at first . She spent t all in 3 stores. In each store, she spent $2 more than half of what she had when she entered.
a) How much did she spend at the last store?
b) How much did she have at first?

Hi doraemo

Good Afternoon.

I'll just provide some guideline and leave it to your kid to work out the details. Use "Working Backwards"

"She spent all of her money in 3 stores." in place of "She spent t all in 3 stores."

Hope this helps.

Best wishes

[snowball]

3/4 of Cara's monthly allowance is equal to 6/7 of Lily's monthly allowance.
Both Cara and Lily spent the same amount each month. At the end of the month, Cara had four gimes as much money as Lily left.
They spent a total of $400 in a month.
(a) what fraction of Cara's monthly allowance was Lily's allowance
(b) How much was Cara's monthly allowance?
TIA

[BigDevil]

[ozora]

need some guide.
Mary had some beads. 2/5 of her beads were black and 1/10 of her beads were blue.
the remaining beads were red.
Mary used all her red beads to decorate some purse. The number of red beads used for each purse was 1/8 of the total number of beads. How many purses were decorated/
thanks