First one:

I am sorry, the picture quality is bad and I cannot read the second question. My apologies.

2nd question

Maggie, u meant 8u = 152, right?

Thanks to all for the solution

Yes, that's a typo.

Maggie Lukes your solution is spot on. Typo happens to the best of us. :) Good work.

Shaw Feng : Happy to help. Regards

Thank you Xavier Sng! I am learning this method from this forum, so it's nice to know I'm getting it.

Maggie Lukes good for you. Just remember that the model or bar method is basically algebra presented in bars and blocks, and it will be a breeze.

Hope it's correct.

Thk

The main step is to make the number of red buttons she has equal to the number of red buttons she used. What she has: fraction of red to blue is 1/4, multiplied to 3/12. What she has: fraction of red to blue is 3/5. So for every dress that she makes, she ends up with 7units of blue buttons extra. As she is left with 28 blue button, 1unit is 4. (a) 4x3=12 red buttons (b) 4 dresses

Thanks for the clear explaination Marcus , but could you write down how you obtained 4 dresses ?

Fractions/ratios/percentages are just simplified expressions of multiplications. In this case, the "multiplying factor" is the number of dresses. The more dresses there are, the more buttons will be used. But the fraction of red/blue buttons used for each dress remains the same! As each dress comprises the same number of red and blue buttons, we can take it that there are 3 red buttons and 5 blue buttons on each dress. So basically, in a model, one unit = one dress. If Betty wanted to use up ALL her buttons, for every 3 red buttons she uses, she would have to use 12 blue buttons. However, she only uses 5 blue buttons per dress. So this means, for every dress she makes, she has 7 blue buttons extra. As she has 28 blue buttons extra in the end, I take 28 (extra blue buttons) divided by 7 (extra blue buttons per dress) to get 4 dresses.

Thanks for the detailed explanation.

Math guru Janice Chuah Geok Lin

5u--shirts sold on Friday 6u(20% more) sold on Saturday 5ux$30= $150u 6u x ???= $171u ( 14% increased) 171/6= $28.50

$28.50 --price sold on Saturday $30-- price sold on Sunday $30-$28.50/$30 *100% = 5% discount (answer)