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Gek Poh

Asked 9 years ago

SG Primary 6 Number and Algebra

I feel that the answer is not right...cannot say that 1u =360.

Replies 7

Izam Marwasi

DVD-> 40u. TV-> 50u [" before DisCount"] DVD 32u. TV -> 40u [[[ after 20% discount ]]] Discount-> 18u=$360

6 years ago

Izam Marwasi

TV original Price 50u= $360/18 x 50 --> $1,000 (answer)

6 years ago

Xavier Sng

Ratio of price of TV to price of DVD player = 5 : 4 (125% : 100%) The discount for the TV = 5/9 × $360 = $200 (20% of the original price) Original price of TV was $200 × 5 = $1000

6 years ago

Izam Marwasi

Nice one Xavier Sng.. So the discount for the DVD will be calculated as 4/9of $360=$160...got it...thks Learnt something new today.thanks

6 years ago

Xavier Sng

We all do, Izam. Like I mentioned before, you more than hold your own :)

6 years ago

Soo Vei Li

For students who need a visual model... We may also work out the 20% as 20% of 225 units = 45 units which equals 360.

6 years ago

Gek Poh

I attempted to find 80% of 225.the selling price after discount. From your guidance, realise there is no need to. Thanks for helping. .

6 years ago

Jennifer Cham

Asked 9 years ago

SG Primary 5 Number and Algebra

Need help to solve this question, thank you!

Replies 1

Xavier Sng

The ratio of the first cut = 2 : 3 = 8 : 12 The longer cut is cut into two parts in the ratio of 1 : 3 = 3 : 9 The required ratio is thus 3 : 8 : 9

6 years ago

Geraldine Koh

Asked 9 years ago

SG Primary 6 Number and Algebra

Hi, can someone please help with explanation and working? Tks in adv.

Replies 3

Xavier Sng

Let us assign 50 units to represent Natalie's savings. Melissa had 20% more than Natalie, hence Melissa had 120% of 50 units = 60 units Olivia had 70% of Melissa's savings, hence Olivia had 70% of 60 units = 42 units In summary, Melissa 60 units Natalie 50 units Olivia 42 units Olivia received 21 units (50% of her original savings), of which Melissa accounted for 6 units and Natalie 15 units based on the ratio of 2:5. In summary, the final Melissa -> 60 - 6= 54 units Natalie -> 50 - 15 = 35 units Olivia -> 42 + 21 = 63 units 54 - 35 = 19 units -> $167.20 1 unit = $8.80 63 units = $554.40

6 years ago