angel:

60% of the number of marbles in box A is equal to 75% of the number of marbles in box B. Box C has half the number of marbles in box A. Box B has 60 marbles more than that in box C.


a) How many marbles are there in box A?
b) How many marbles must be transferred from box B to box C so that box C has 90% of the number of marbles in box A?

60% A = 75% B

4 A = 5B
2C = A
B = C + 60

Above = 3 equations and 3 unknowns = solved

4A = 5(C+60).....5C = 2.5A
4A = 2.5A + 300
1.5A = 300
A = 200

B) C = 50% A
For C to be 90% A .... C needs to gain 40% of A
40% of 200 = 80

BigDevil:

Swift Formula:

[quote=\"Green-apple\"]can help


3/4 is 1/12 small then x/y?

How to do?

thanks

3 quarters is one twelveth smaller than x/y
Form equation.
x/y + 1/12 = 3/4

:skeptical:
Shouldn't it be x/y - 1/12 = 3/4, not plus?[/quote]yup u'r right

EC72:

Among the 200 dollar notes that a cashier collected, some were two-dollar notes and the rest were five-dollar notes. The total value of the two-dollar notes was $230 less than that of the five-dollar notes, how many two-dollar notes did the cashier collect?


Can someone help me with this question. Thank you.

200 = x + y
y = 200 - x
2x + 230 = 5y
2x + 230 = 5(200-x)
2x + 230 = 1000 - 5x
7x = 770
x = 110

Green-apple:

can help


3/4 is 1/12 small then x/y?

How to do?

thanks

3 quarters is one twelveth smaller than x/y
Form equation.
x/y + 1/12 = 3/4

janet88:

I go to jem every Saturday to stock up grocery & buy lunch before picking kids from tuition...with my 'driver' who also doubles up carrying ntuc bags :evil:

personal driver.... hubby ? Lolz..
Meet friends = weekdays
weekends always booked by family or work =/

Kidsprodigy:

My home uses singtel cos of mio TV. I still prefer singtel serviceS generally. I have a friend who recently apply for a corporate line with m1 and they took very long before they fix the line and the services from the staff is really bad.

fix the line? why the line need to be fixed?
Apply for mobile line just activate within 1 or 2 days. most of the service staff are standard replies.
can means can
cant means cant

janet88:

300 mbps or 500 mbps (singtel voucher from fun pack) is good enough for simple home users like me...can you imagine we lived with only 6 back then? every weekend, our broadband literally slow like tortoise


I get to enjoy my childhood cartoons now...so happy. revised my housework schedule :rotflmao: mop at night...so mornings free to either visit KSP earlier or cartoon time.

stay near enough to Jurong to come out la kopi? xD
:celebrate:
I still rmb the dialing model for 56kbps. >_>
Modem gives off excellent \"music\"

janet88:

Now the speed is zoom zoom...so shiok.


When bored, watch cartoon. Hubby went, :? Second childhood?

:rotflmao: Finally found someone can enjoy cartoon too at this age :evil:
Cartoons in the past >_> too low quality to be watched.
1080p movies and anime is awesome ~

yolomomo:

Anyone using 1gbps?

Reporting for duty ma'am !
:salute:

leo_mums:

At first, 30% of the beads in a bag were blue and the rest were yellow. There were 128 more yellow beads than blue beads. Some yellow beads were taken out, reducing its number by 25%. Find the ratio of the number of blue beads to the number of yellow beads in the end. Leave your answer in its simplest form.


*Is the answer 4:7 ?*

There were 128 more yellow beads than blue beads. <-- this sentence is of no use.

30% vs 70%

Yellow dropped by 25% = 75% x 70% = 52.5%

30% : 52.5% = 12: 21 = 4:7
:udawoman: