Q&A - PSLE Math

[fantasy1]

Hi


Can anyone help to solve these 2 maths problems?

1)Last month May spent 1/4 of her income on transport, 45% on food and saved the rest.
Her income was increased by 1/10 in this month.
She spent the same amount on transport but increased her savings by 30%.
She saved $780 this month.
(a) how much did she spend on food this month?

2)7 apples cost as much as 2 mangoes. 5 oranges cost as much as a mango. Find the ratio of the cost of one appl to the cost of one mango to the cost of one orange.


Thanbk You

[tianzhu]

fantasy1:

Hi


Can anyone help me with these 2 problems?

1)Last month,MAy spent 1/4 of her income on transport, 45% on food and saved the rest.
Her income was increased by 1/10 in this month.
Spent the same amount on transport but increased her savings by 30%.
She saved $780 this month.
(a) How much did she spend on food this month?


2)7 apples cost as much as 2 mongoes. 5 oranges cost as much as a mango.
Find the ratio of the cost of one applke to the cost of one mango to the cost of one orange.

Hi

1)

A neat way is to use MD.

Consider the savings this month.

13u ------ 780

10u ------- 600 (last month’s savings)

Last month

25% ------- transport

45% ------- food

30% -------- food

30% -------- 600

10% ------- 200

Income last month ------- 100% ------- 2000

Income this month ------- 2200

Transport ------- 500 (same amount)

Savings ------- 780

Food’s spending ------- 2200 – 500-780 ------- 920

2)

Use 70 units for the cost.

1 apple ------- 10 units

1 mango ------ 35 units

1 orange -------- 7 units

A : M: 0 ------- 10:35:7

Best wishes

[kwcllf]

Hi please help.


2 pieces of ribbon and 3 pieces of lace cost $10.
3 pieces of ribbon and 2 pieces of lace cost $y.
What is the total cost of 1 piece of ribbon and 1 piece of lace?
Give the answer in terms of y.


Thanks!

[fantasy1]

Hi

does anyone know how to solve ?

Thank You

[charsen]

kwcllf:

Hi please help.


2 pieces of ribbon and 3 pieces of lace cost $10.
3 pieces of ribbon and 2 pieces of lace cost $y.
What is the total cost of 1 piece of ribbon and 1 piece of lace?
Give the answer in terms of y.


Thanks!

Hi
This question can be solved using grouping method.

You can find the price of 5 pieces of ribbon and 5 pieces of lace,which is
$(10+y).
So cost of one ribbon and 1lace is
$(10+y)/5=(2+y/5)(ans)
Cheers.

[Michaelia0816]

Could anyone kindly help me to solve the question below, thx you.


Sani and Roney had a total of 398 game cards, Sani had 74 more game cards than Roney. After Roney had sold 25% fewer game cards than Sani, he had half as many game cards left as Sani. How many game cards had Roney left?

[rsorchid]

Pls help, Thanks.


A florist had some roses, tulips and carnations. After selling some of them, there were 6 tulips for every 5 roses and 7 roses for every 3 carnations. After selling 168 roses, she had 456 tulips and carnations left. The number of tulips sold was the same as the number of carnations sold.
a) How many roses had she at first?
b) If the number of tulips was twice the number of carnations at first, what is the total number of tulips and carnations sold?

[tianzhu]

Michaelia0816:

Could anyone kindly help me to solve the question below, thx you.


Sani and Roney had a total of 398 game cards, Sani had 74 more game cards than Roney. After Roney had sold 25% fewer game cards than Sani, he had half as many game cards left as Sani. How many game cards had Roney left?

Hi

You may use MD or UP.

Due to time constraints, I’ll skip the MD.

At first
Roney -------- 162
Sani ------- 236

Sold
Roney -------- 3u
Sani ------- 4u

In the end
Roney -------- 1p
Sani ------- 2p

3u + 1p ------ 162
(x2)
6u + 2p ------- 324

4u + 2p ------- 236

Equalize the parts.

2u ------- 88

1u ------- 44

132 + 1p -------- 162

1p ------- 30(Roney’s cards @end)

Best wishes

[kwcllf]

charsen:

kwcllf:

Hi please help.


2 pieces of ribbon and 3 pieces of lace cost $10.
3 pieces of ribbon and 2 pieces of lace cost $y.
What is the total cost of 1 piece of ribbon and 1 piece of lace?
Give the answer in terms of y.


Thanks!

Hi
This question can be solved using grouping method.

You can find the price of 5 pieces of ribbon and 5 pieces of lace,which is
$(10+y).
So cost of one ribbon and 1lace is
$(10+y)/5=(2+y/5)(ans)
Cheers.

Thanks charsen!

[Dazzle]

Pls help. Q 9 from MGS Prelim 2012


Bottle A and bottle B both contain some juice.
If 1.3 litre of juice was poured into bottle A, the volume of juice in A will be 1.6 times that of the volume of the juice in bottle B.
If 480 ml of juice was poured into bottle B, the volume of juice in bottle B will be 1.8 times that of the volume of the juice in bottle A.

(a) What is the volume of juice in bottle A? (Ans. 1.1 litre)
(b) what is the difference in the volume of juice in both bottles? (Ans: 0.4 litre)