Q&A - PSLE Math

[BigDevil]

vvv
Q: 1695506
Subject: {Math}
Level: {P6}
Tags: {Ratio}
Source: {P6 Maths 2015 Preliminary Examination 2015 - Nanyang Primary School}
^^^

After S paid,
S:M:R -> 3:8:9

After R paid,
S:M:R -> 5:4:1 or 10:8:2

After M paid,
S:M:R -> 10:1:9

S -> 10u
M -> 8u
R -> 9u
Meal -> 10u - 3u = 7u

S had $40 more than M,
10u - 8u = 40
2u = 40
1u = 20

Cost of meal -> 7u = $140

[vaun]

vvv
Q:
Subject: {Math}
Level: {P6}
Tags: {Fractions}
Source: {methodist , SA1, 2014}
^^^

Mrs Tan baked 185 more chocolate cupcakes than lemon cupcakes. After selling 3/5 of the chocolate cupcakes and 1/2 of the lemon cupcakes, she had 146 cupcakes. How many cupcakes did she sell ?

Can someone help up this question ? showing the working ? Thank you very much

[Ender]

vvv
A: 1695569
Subject: {Math}
Level: {P6}
Tags: {Fractions}
Source: {methodist , SA1, 2014}
^^^

Lemon cupcakes = 10u
Choc cupcakes = 10u + 185

Why select 10u? Coz 10 is LCM of 2 and 5, i.e. can be divive by 2 and 5 (1/2 or 1/5).

After sales,
Lemon = 5u , {1/2 of 10u}
Choc = 4u + 74 , {2/5 of (10u + 185)

5u + 4u + 74 = 146
9u + 74 = 146
9u = 72
u = 8

At first total cupcakes = 10u + 10u + 185 = 20u + 185 = 345
Number of cupcakes sold = 345 - 146 = 199

[RJ_164]

Subject: {Math}
Level: {P6}
Tags: {percentage}
Source: {P6 Maths 2015 Preliminary Examination 2015 - Singapore Chinese Girl's School}

Please help me solve this problem.

The number of children in a town decreased to 8827, while the number of adults increased by 42% to 15194. The total number of people decreased by 259.

Q1. What is the increase in number of adults?
Q2. What is the percentage decrease in the total number of children?

[alfretztay]

Subject: {Math}
Level: {P6}
Tags: {percentage}
Source: {P6 Maths 2015 Preliminary Examination 2015 - Singapore Chinese Girl's School}

Please help me solve this problem.

The number of children in a town decreased to 8827, while the number of adults increased by 42% to 15194. The total number of people decreased by 259.

Q1. What is the increase in number of adults?
Q2. What is the percentage decrease in the total number of children?

Subject: {Math}
Level: {P6}
Tags: {percentage}
Source: {P6 Maths 2015 Preliminary Examination 2015 - Singapore Chinese Girl's School}
Q1.

100 + 42 = 142

142% ------- 15194

1% ------- 15194/142 = 107

100% ------- 107 x 100 =10700

15194 - 10700 = 4494


Q2.

4494 + 259 = 4753 (decrease in the number of children)

4753 + 8827 = 13580 (total number of children at first)

(4755/13580) x 100% = 35%


Ans : Q1. 4494; Q2. 35%.

[Fly2high]

Level : {p6}
Tag :{Volume}
Source : {2014 prelims Nanyang q14}


Hi all,

Pls help on the below !

[Fly2high]

Thanks very much Homeschool !!

[vaun]

Thanks.

[belnanna]

Can someone please help. Thanks in advance

[belnanna]

Please help, thanks!