XiaoMi powerbank 20,000mAh. User of 2.

snowball:

Linden had 29 more fifty-cent coins than ten-cent coins.

After he had used 37 fifty-cent coins, the value of the fifty-cent coins was $3.20 more than the value of the ten-cent coins.
How many fifty-cent coins and ten-cent coins did he have at first?

TIA

fifty cent = 1 unit + 29 - 37 = 1 unit - 8
ten cent = 1 unit

We make it 1 unit of fifty cent and 1 unit of ten cent
so the different will be $3.20 + $0.50 x 8 = $7.20
$7.20 divided by ($0.50 - $0.10) = 18
1 unit = 18.
At first : 2 units + 29 = 2 x 18 + 29 = 65

PollutedS:

Hi everyone!


Why is (2/3x-2) - (1/ 2-3x) = (3/3x-2) [Note: They are all fractions]

Thank you! :?:

http://i64.tinypic.com/50m8f7.jpg\">
*Right Click -> View Image*
This forum likes to post square images only

This is secondary school level
Proving LeftHandSide = RightHandSide
LHS = RHS

sssm:

Hi, can someone help me with this 2 questions? thank you so much


A survey was conducted on a group of pupils who liked chocolates and sweets. 3/5 of the pupils like to eat chocolates. 1/2 of them liked to eat both chocolates and sweets. 40 pupils like to eat only sweets. How many pupils like to eat sweets?

20% of the cost of the book was $2 more than 1/10 of the cost of a bag. If the bag cost $50 more than the book, find the cost of the book.

:thankyou:

40% = 40 = sweet only
50% = chocolate and sweet.
40% = 40
90% = 90 (Ans)

20% Book - 10% Bag = $2
2 Book - Bag = $20 ........Equation 1
Bag - Book = $50 ........Equation 2

Equation 2 + Equation 1 :
Bag - Book + 2 Book - Bag = $20 + $50
Book = $70

zinmkw:

Please help for this question, thanks in adv


Every day, Alif, Lenny and Vishnu are assigned different duties as prefects. They take turns to either raise the flag, record the names of latecomers or lead in pledge-taking. In how many different ways can they be rostered to carry out these duties on any one day.

A L V
A V L
L A V
L V A
V A L
V L A

Therefore six ways .

timtim:

pirate:

You can't see the connection between the model and the algebra?

Why should I and why the need to??

Model is almost the same as algebra.
1 unit = 1a = a

KSP2013777:

Can somebody pls help me with this question?


http://i62.tinypic.com/148du2u.jpg\">

TIA

Volume of tank = 448 x 22 = 9,856 ml
Figure 1 shows the volume of 8 blocks + water = 10/22 of tank (4,480 ml)
Figure 2 shows the volume of 3 blocks + water = 3/8 of the tank (3,696 ml)

To make the number of blocks the same, (because questions ask for vol of water)
(If we make the number of water the same, we will be finding the vol of blocks)
From figure 1(x3) : 24 blocks + 3x Water = 13,440ml
From figure 2(x8) : 24 blocks + 8x Water = 29,568ml

From above equations, 24 blocks is equal to ....

13,440 - 3x Water = 29,568 - 8x Water
5x Water = 16,128
Water = 3,225.6 ml

Question is set to hide the ratio of 10cm to 22cm and 3 blocks to 8 blocks .
Once the student sees this , he/she will understand and utilize the given information to solve the question.

It is my style to teach students like that.
See a question you don't know how to solve?
Don't panic. Analyze the situation with your calm mind.
Retrieve all the information given, try to form equations.
If they dont understand \"form equations\", it has same meaning as \"link up the numbers\".

I bought a Note 2 @ S$180 .

Don’t watch ANY video on handphone .
Use microsd card to store and watch .

Hi , most P1 questions consist of only 1 or 2 blanks only .

E.g 10 , 15 , 20 , _ , 30
or 10 , _ , 20 , _ , 30 , 35 , 40

James Ang:

PSLE Maths Question today.

1. What is the likely weight of 8 $1 coins?
(A) 6 grams
(B) 60 grams
(C) 600 grams
(D) 6 kilograms

My student Isabelle put as 60 gram (B)

You should know if you are a tutor or teacher.
6g is too light... for 1 coin maybe possible.
8coins = 6g means 1 coin less than 1g can be blown away by mouth.
60g is possible
600g will be like weight of 4 iphones
6kg will be weight of school bags perharps?