Q&A - PSLE Math

[2632parent]

Need help on this question


1) The cost of 3 apples is the same as the cost of 2 oranges. The total cost of 4 apples and 3 oranges is $3.40. Mrs tan bought 7 apples and 5 oranges. How much did she pay for the apples and oranges altogether?

Thank you

[tianzhu]

2632parent:

Need help on this question


1) The cost of 3 apples is the same as the cost of 2 oranges. The total cost of 4 apples and 3 oranges is $3.40. Mrs tan bought 7 apples and 5 oranges. How much did she pay for the apples and oranges altogether?

Thank you

Hi

You may use MD or work with units.

1 apple ----- 2 units

1 orange ----- 3 units

4*2 + 3*3 ------- 17 units

17 units ------- 340

1 unit ------ 20

Mrs Tan bought 7 apples and 5 oranges.

7*2 + 5*3 ------ 29 units

29*20 ------ 580

She paid $5.80

Best wishes

[2632parent]

Thank you councillor for your speedy reply, sorry I have another question for you.


1) Packet A, Packet B and Packet C each contained some salt. At first, there were 200g more salt in Packet A than Packet b. Packet C had 3/4 of the amount of salt in Packet A. After 1/8 of the amount of salt in Packet A was transferred to Packet B, there was 82.15g of salt in Packet B. How many percent less salt were there in Packet C than in Packet A at first?

Many many thanks

[tianzhu]

2632parent:

Thank you councillor for your speedy reply, sorry I have another question for you.


1) Packet A, Packet B and Packet C each contained some salt. At first, there were 200g more salt in Packet A than Packet b. Packet C had 3/4 of the amount of salt in Packet A. After 1/8 of the amount of salt in Packet A was transferred to Packet B, there was 82.15g of salt in Packet B. How many percent less salt were there in Packet C than in Packet A at first?

Many many thanks

Hi

Packet C had 3/4 of the amount of salt in Packet A.

A ------ 4 units

C ------- 3 units

C ------- 1 unit less than A

% ------- ¼*100% ------- 25%

Best wishes

[2632parent]

Ha! Ha! What a simple solution. get confused with all the extra information given. This is actually a 5 marks question from Nanyany primary school preliminary paper 2011. Thank you so much for your help.

[zanen]

in a test of fuel consumption, two cars, P and Q, each travel a distance of 720km.

For every litre of petrol used, Car Q travels 3km more than Car P.
Car P uses 12 litres of petrol more than Car Q.
Find the number of litres of petrol each car has used for the journey.
please help me as i am taking retake prelim tmr. thanks

[niza6666.028774hotmail.028774com]

Hi I need help on this question. Please help, thanks in advance.

Miss Lee baked some pies to sell at a fun fair. 4/5 of them were beef pies while the rest were chicken pies. At the end of the fun fair, she sold 100 chicken pies and 7/8 of the beef pies. 1/6 of the pies remained unsold. If each pie cost $2.50, how much did Miss Lee collect from the sale of the pies?

[2DMommy]

Please help me with these questions :


1) Paris had a total of 1686 red, blue, green marbles for sales. The ratio of the number of red marbles to the number of blue marbles is 2:3. After Paris sold 75% of the blue marbles and 50% of the green marbles and none of the red marbles, she had 922 marbles left. How many blue marbles were there at first ?

2) If Sam gives Terry $350, he will have 4 times as much money as Terry. If Sam gives Terry $550, he will have thrice as much money as Terry. How much money does Sam have ?

Thank you !

[whitety]

Hi, need help on this qn.


In a bag, there are 20-cent and 50-cent coins. There are 28 more 20-cent coins than 50-cent coins but the total amount of 50-cent coins is $3.40 more than that of the total amount of 20-cent coins. How many 50-cent coins are there in the bag?

Thanks!

[zanen]

in a test of fuel consumption, two cars, P and Q, each travel a distance of 720km.

For every litre of petrol used, Car Q travels 3km more than Car P.
Car P uses 12 litres of petrol more than Car Q.
Find the number of litres of petrol each car has used for the journey.
please help me as i am taking retake prelim tmr. thanks