Q&A - P5 Math

[MathIzzzFun]

Oracle:

Hi Tianzhu/007, I have another question here:


A badminton racket costs $24 more than a table tennis bat and $9 more than a basketball. Benedict bought 2 badminton rackets, 3 table tennis bats and 3 basketballs and paid a total of $279. How much did the basketball costs?

Thank you very much.

using MD..

http://i50.tinypic.com/swboug.png\">

cheers.

[snowball]

MathIzzzFun:

snowball:

[quote=\"snowball\"]pr5 school hw, pls help to solve... :?:


Q1
Mr Tan painted 2/5 of his flat yesterday. Today, he continued painting and now he has painted 5/6 of his flat. How much of the flat did he paint today?

Q2
Kate has 3/5m of ribbon. She has 1/4m of ribbon less than Siti. How much metres of ribbon does Siti have?

Q3
Gopal had a coil of wire. He cut 2/7m away and used the remaining 1/6m to make a hook. Find the length of the original coil of wire.

Q4
Mary takes 5/6 h to rake the leaves. David takes 1/4h less than Mary to rake the leaves. Bala takes 1/6h longer than David. How long does Bala take to rake the leaves?

Anyone know whether i can find above solution in \"Onsponge assessment bk?

TIA

still :?: :?: :frustrated: :imdrowning: :imdrowning:
anyone there to help me solve the above?

Q1.
painted today --> completed - painted yesterday
= 5/6 - 2/5
= 13/30

Q2.
Kate --> 3/5 m ribbon
Siti --> 1/4 more --> 3/5 m + 1/4 m = 17/20 m

Q3.
Original length --> cut away + remaining
= 2/7 m + 1/6m
= 19/42 m

Q4.
Mary --> 5/6h
David --> 1/4h less than Mary --> 5/6h - 1/4 = 7/12 h
Bala --> 1/6 h more than David --> 7/12h + 1/6 h = 9/12h = 3/4 h

cheers.[/quote]
your solution is so amazing!!! :please:
Looking from the angle of your solution, the question seems so much easier and simple !

[Oracle]

Thank you Snowball & MathIzzzFun!

[Oracle]

Hi Math Gurus,


Please may I know how to solve this using the supposition method:
Kumaran had 64 coins in his coin box. There were 20-cent coins and 50-cent coins. The total value of all the coins was $18.50. How many 20-cent coins and how many 50-cent coins were there? Thank you very much.

[Oracle]

One more?


A sweet cost 15 cents and a packet of 8 similar sweets cost $1. Clement bought exactly 37 sweets. What was the least amount of money that Clement spent on the sweets?

[php]

Oracle:

One more?


A sweet cost 15 cents and a packet of 8 similar sweets cost $1. Clement bought exactly 37 sweets. What was the least amount of money that Clement spent on the sweets?

4 packets -> 4 x 8 = 32 sweets ($1 x 4 = $4)
5 sweets ($0.15 x 5 = $0.75)

Total spent : $4.75

[MathIzzzFun]

Oracle:

Hi Math Gurus,


Please may I know how to solve this using the supposition method:
Kumaran had 64 coins in his coin box. There were 20-cent coins and 50-cent coins. The total value of all the coins was $18.50. How many 20-cent coins and how many 50-cent coins were there? Thank you very much.

assume all are 50-cent coins --> 64 x $0.50 = $32
$32-$18.50 = $13.50 --> excess value assumed for 20-cent coins
Number of 20-cent coins = $13.50 /($0.50-$0.30) =45
number of 50-cent coins = 64 - 45 = 19

cheers.

[Oracle]

Thanks PHP. So the last 5 sweets that do not form a packet need to be accounted for individually i.e., 15 cents each.

[Oracle]

Here’s another:


During a mathematics test, Raymond scored 14 marks more than Krishnan and 7 marks more than Edison. Given that Raymond and Krishnan scored 73 marks more than Edison, what was Raymond’s score for the test?

[MathIzzzFun]

Oracle:

Here’s another:


During a mathematics test, Raymond scored 14 marks more than Krishnan and 7 marks more than Edison. Given that Raymond and Krishnan scored 73 marks more than Edison, what was Raymond’s score for the test?

Raymond scored 7 more than Edison
Raymond and Krishnan scored 73 more than Edison
so, Krisnan's score = 73-7=66
Raymond's score = 66 + 14 = 80
Edison's score = 80-7 =73


cheers.