Thank you for the help.

Help! Help!

How can we solve this qn below without using calculator?

Which one of the following is a factor of (2 to power of 20) – 1 ?

A. \t29 B. \t31
C.\t37 D. \t43
E.\t47

Ans: B

jieheng:

Qwertymum:

My son asks me a Math question from his MY Revision Paper which I need help. Find it rather challenging! Or if there is something not right? Could anyone out there kindly help to solve, thanks in advance.


\" A father in his will left all his money to his children as such: $1000 and 1/10 of what then remains to the first born; then $2000 and 1/10 of what then remains to the second; then $3000 and 1/10 of what then remains to the third born; and so no. When this was done each child had the same amount. How many children were there? \"

Father's money [-1000-][1U][-------------------9U-------------------]
Father's money [-1000-][1U][--2000--][1P][-----------9P-----------]

Father's money = 1000 + 10U

the money that 1st child will receive = 1000 + 1U

the money that 2nd child will receive = 2000 + 1P

Each child will receive the same amount of money
1000 + 1U = 2000 + 1P
1U = 1000 + 1P ------------(1)

9U = 2000 + 10P ----------(2)

(1)*9 , 9U = 9000 + 9P ---(3)

(2) = (3) ,

2000 + 10P = 9000 + 9P
1P = 7000

From (1)
1U = 1000 + 1P = 1000 + 7000 = 8000

Father's money = 1000 + 10U = 1000 + 10*8 = 81000

the amount of money that each child will receive = 1000 + 1U = 9000

No of children = 81000 / 9000 = 9

:thankyou: Wow! That's fast. Thanks a lot.

My son asks me a Math question from his MY Revision Paper which I need help. Find it rather challenging! Or if there is something not right? Could anyone out there kindly help to solve, thanks in advance.


" A father in his will left all his money to his children as such: $1000 and 1/10 of what then remains to the first born; then $2000 and 1/10 of what then remains to the second; then $3000 and 1/10 of what then remains to the third born; and so no. When this was done each child had the same amount. How many children were there? "

Does anyone know the cca trial dates this year?

Does anyone know the cca requirements for squash, debate and scouts because my ds is interested in them.

Thanks,
Qwertymun

Does anyone know the selection criteria for debate and squash cca??

P

My DS Just Got into HCI. Got a question i’m not sure about.

Does anyone has the list of CCAs and their days.

Thanks, Need it for time-tabling.

joe0599:

Qwertymum:

Help!!! :?: :?:

My son scored 255+2 for PSLE and is appealing to hci.
Heard that hwa chong cop is 259.
What are his chances of getting in via appeal?
He's in gep Programme.

HCI COP is 258....my DS got in with 257+2...

Did you put HCI as your first choice? What school is he posted?

Your son T-score is quite close to the COP....worth trying..Good luck!

Yes, its his first choice I hope he gets in. He's posted to second choice acsi should be ib