Question

If a:b=5:7 and a:c=3:4 Find 1)b:c 2)a:b:c

Answer 1

• a:b = 5:7 = 5 x 3 : 7 x 3 = 15 : 21
• a:c = 3:4 = 3 x 5 : 4 x 5 = 15 : 20
• a:b:c = 15 : 21 : 20
• b:c = 21:20

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