Hi, any other ways to solve the below question besides guess n check?

The number of ducks is 10 fewer than the number of dogs. The dogs have 3 times as many legs as the ducks. How many ducks and dogs are there?

Hi Please help with these 2 questions, thanks. a) Serene had $330 more than Lynette. Each of them spent some money on books. The amount of money Serene spent was 3/4 of the amount of money Lynette had at first. The amount of money Lynette spent was 1/5 of the amount of money Serene had at first. In...

Hi Please help with these 2 questions, thanks. a) Serene had $330 more than Lynette. Each of them spent some money on books. The amount of money Serene spent was 3/4 of the amount of money Lynette had at first. The amount of money Lynette spent was 1/5 of the amount of money Serene had at first. In...

Hi Tianzhu, I thought that if there is a remainder ($4 left), we should add 4 to the multiples and if there is a short ($4 short), we should minus 4 from the multiples? Regards. Hi mummy cftan I am afraid you are getting it mixed up with another similar type of question. A shopkeeper had some mango...

Just wondering why can't this question be solved using the concepts of multiples as in the question on sweets that Tianzhu had shared few posts earlier? Hi cftan Yes, you may use the concepts of multiples to solve your question. I've shown two approaches. Hope this helps. Best wishes. [img]http://f...

Thank you, XXXX

Hi, Need help for the following question: Some students plan to buy a gift for their classmate. If each of them pays $2, they will be short of $4 for the gift. If each of them pays $3, they have $4 left. If there are fewer than 10 students, how much does the gift cost? They each contribute $1 more ...

Hi,

Need help for the following question:

Some students plan to buy a gift for their classmate. If each of them pays $2, they will be short of $4 for the gift. If each of them pays $3, they have $4 left. If there are fewer than 10 students, how much does the gift cost?

cathycho wrote:

tianzhu wrote:

BigDevil wrote:Thanks, tianzhu.
Answer is 9, correct?

Hi Big Devil

Good Morning.

You're welcome.

You are correct.

Best wishes

Hi Tianzhu,

Can show me the solution?

$18-$13.5=$4.5
$4.5/$0.5=9

How can be approach this question using model methods? Hi cftan Hope this helps. Best wishes. http://farm6.staticflickr.com/5462/9338967765_11236f9ce1_z.jpg Thanks, Tianzhu. Very clear explanation with the models. But I can never derive to such a model. How would one think that the 12 given marbles...