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4 Small = 3 large
a) 12 Small = 9 Large ###, Substitute into the 960cm equation

12 Small + 7 Large = 960cm
9 Large + 7 Large = 960 cm
1 large = 60cm

12 small = 9 Large
12 Small = 540
Small = 45 cm

Remain stars to make
Small = 2 stars needed
Large = 13 stars needed

b) Lenght for small stars = 2X45 =90cm
Lenght for large stars = 13 X 60 = 780cm
Total needed for remaining stars = 870cm ###

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