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Question

Hi, Please help to solve this question. Besides using Algebra, any other solutions?

Thank you.

Answer


The extra 300 ribbons comes from the groups of 75 ribbons (greyed out boxes).
There are 300/75 = 4 groups (of 25 pink, 50 blue in 2nd row).
So total is 4 x (25 pink + 50 blue) + 800 pink = 1100 ribbons.

No algebra! :-P

CHECK:
4 x 50 blue = 200 blue. Top row has 200/25 = 8 groups (of 50 pink, 25 blue).
Total in top row: 8 x (50 pink + 25 blue) + 500 = 1100 ribbons.

0 Replies 4 Likes ✔Accepted Answer

For the blue ribbons sold in case 1 and case 2 (the blue ribbons are equal in both cases), 

So  25(number of weeks sold) = 50 (number of weeks sold)

This means the number of weeks in case 1 is twice the number of weeks in case 2.

So let the number of weeks in case 2 be u, then number of weeks in case 1 = 2u

Pink ribbons in case 1 = pink ribbons in case 2 : 

50(2u)+500 = 25u + 800

75u = 300 => u=4

So pink ribbons = 25(4) + 800 = 900

blue ribbons = 50(4) = 200

Total ribbons = 900+200 = 1100

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Video Solution can be viewed Here

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