Answer:
Each strip is 117.6 cm
Step-by-step explanation:
I created a proportion of hearts to others. On strip A there is 1 heart to 2 others and B there is 1 heart to 3 others. I added them and got a proportion of 2 hearts to 5 others for both. With a total of 56 hearts, I set up a proportion to determine the total stickers
2/5=56/x
When I cross multiply, I get 2x=280 and x=140
so for the 56 total hearts, I have 140 others. I added those to get the total stickers and got 196. I multiplied that by 1.2cm and got 235.2 cm for both. Since both are the same size, just divide that by 2 and get 117.6 cm each.
I you use 1/6 of the bag for 1/2 a pound then you need to set up a proportion.
1/6 bag / 1 bag = 1/2 pound / x pounds Cross Multiply
(1/6)*x = 1/2 pounds * 1 bag Divide by 1/6
Remember: in a 4 level fraction, the denominator inverts and multiplies.
x =

3 pounds <<<<
answer