Thanks Izam Marwasi.

This is the correct one

Earlier was wrong. Should be $105.60 ÷ $2.20(Dif) and NOT $105.60 ÷ $0.30.. Sorry for the error earlier..

Area of triangle = 180.5 Area of square = 180.5 x 2 = 361 Number of small squares on each side = square root (361) = 19

Number of squares used = 18 + 17 + 16 + ... + 3 + 2 + 1 = (18 / 2)( 1 + 18 ) = 171

Thanks Rye n Raymond.

Thanks for sharing Xavier. You are right. The model method is indeed powerful in these sort of qns.

The pleasure is mine, Sir.

Is this correct? I am also learning about the model method from this forum.

You are spot on. Kudos

I didn't know ib course is also learning model

My daughter tried to solve this qn. Is the working and and correct?

Hello Samantha. Yes, the working is fine. I would suggest that your daughter utilise the model Adrian posted above as it is simplier. She has done a good job nevertheless.

Thanks Xavier! She didnt use model method for a long time.. However, there is no harm to learn other methods.. Have a nice Saturday! 😊

She did just fine. I can see that she is able to gather her thoughts with the method she employed. Her method appears to me to be in the no-man's-land between model-solution and algebra-solution, so I suppose she is in the progressing stage. Just venturing a guess. Is she in Secondary one?

She will be taking her psle soon.. Thank you for your feedback! 😊

All the best to her. May she pass with flying colours. Regards

Tq tq !!

what is the answer on the answer key?

Irvin Yeo - sorry I do not have any answer key. Tks

1/3 = 3/9 of fruits were papayas 1/9 of fruits were rock melons Hence 5/9 of fruits were watermelons. If a set of fruits consisted of 3 papayas and 1 rock melon, the total cost would be = 3 × $2 + $7 = $13 $156 ÷ $13 per set = 12 sets The amount spent on the watermelons = 12 × $3 × 5 = $180

Thank u so much Xavier Sng. Have a great weekend!

You are most welcome. The same goes to you. Regards

(17-12) × 2 = 10

thanks! i must have thought too deep...haha

12- a=b b+2a=17

17-12 should be 5 right? So 5 x 2 = 10

Yes yes. My mistake.

np...thank you for your help!

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