June Wong
Asked 8 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

Replies 7
KH Puah

X is common between the given 2 ratios. Must make them have the same number. Then and only then you can combine X, Y and Z

5 years ago
KH Puah

X:Y=2:7, multiple by 3 to give 6:21 Z:X=4:3, multiple by 2 to give 8:6 Now, Z:X:Y=8:6:21

5 years ago
Zhong Shu Hao

X:Y ＝ 2:7 ＝ 6:21 (x3) X:Z ＝ 3:4 ＝ 6:8 (x2) X+Z:Y ＝ 6+8:7 ＝ 14:7 ＝ 2:1.

5 years ago
KH Puah

Y should be 21

5 years ago
June Wong

Yes, got it. Thank you all

5 years ago
Koh Lay Koon

Answer: (1)

5 years ago
AisinGioro YongZhen

Can we do it via algebraic method? x/y=2/7 so y=7/2x, z= 4/3x (x+z)/ y = (x+4/3 x) / (7/2 x) = (7/3 x) / (7/2 x) = 2/3 so x+z/y = 2/3 so x+z :y = 2:3

5 years ago

June Wong
Asked 8 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

Replies 6
June Wong

Hi, P5 Question. Thank you.

5 years ago
KH Puah

The ratio of A:C is 5:3. Try to rework on your model and you may be able to solve this problem.

5 years ago
June Wong

Ratio of C: A+B?

5 years ago
KH Puah

The ratio A:B, multiple by 5, ie. 15:5 The ratio A:C, multiple by 3 ,ie, 15:9 This will make A have the same number, namely 15

5 years ago
KH Puah

A:B:C = 15:5:9

5 years ago
June Wong

Yes. Got it already. Thanks. Another one coming up. Same concept but it's a big number. 😰

5 years ago

Andy Yeo
Asked 8 years ago

SG chevron_right chevron_right

thanks for adding!

Replies 0

Vivian Ang
Asked 8 years ago

SG chevron_right Primary 6 chevron_right Number and Algebra

Help please. Thanks.

Replies 4
Paul Booth

what age is this?

5 years ago
Vivian Ang

P6 Paul Booth

5 years ago
BA Poh Ann

5 years ago
Zhong Shu Hao

5 years ago

Vivian Ang
Asked 8 years ago

SG chevron_right Primary 6 chevron_right Number and Algebra

Help please. Thanks

Replies 4
BA Poh Ann

50 + 70 = 120 360 ÷ 120 = 3 3 h after 10.30 p.m., they would meet each other at 1.30 a.m.

5 years ago
Paul Booth

what age is this?

5 years ago
Vivian Ang

P6.Paul Booth

5 years ago
Paul Booth

thank you

5 years ago

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