Question
There were 40 more raisin buns than strawberry buns. After 3/4 of the raisin buns and 4/5 of the strawberry buns were sold, there were 28 buns left.
(a) How many strawberry buns were there at first?
(b) What fraction of the buns sold were raisin buns?
Answer
6 comments:
Thank you for your help.
There are 2200 students in a primary school. Each student attends 10 classes during the day. Each class has 40 students and 1 teacher. During the day, each teacher teaches 10 classes. What is the smallest number of teachers the school can have?
This question is tough. Please let me think about it
Hi there... I didn't get why u multiply 28 by 4....
2nd part of the model featured 4 blocks of 28 raisin buns. that's why 28x4
yeah that one i know...but why must u draw 4 blocks of raisin buns in the 2nd part of the model?
After the selling, 28 buns (1/4 Raisin and 1/5 Strawberry) are left behind.
In the 2nd model 2nd bar, the quantity is supposed to be taken away from the 4x28. So that the net result equals to the original no. of raisin buns. Why times 4 ? Imagine the 28 is represented by the one 1/4 raisin bun (R) and one 1/5 strawberry bun (S). If I repeat 4 times, it will be "RSRSRSRS". Ok, we rearrange it to be "RRRRSSSS" which equals to 4x28. Now "RRRRSSSS" can be aligned with the 1st model.
See my six steps in model approach, it is all about aligning all the models so that we can compare.
2nd model 3rd bar is just simply repeat from the 1st model. That will help us to calculate the "u"
Hope that clears your doubts
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