Question

3. Find the value of ‘a’ in each of the following
a) a : 20 = 15 : 75
b) 7 : 11 = a : 77
Thanks!

Answer 1

a) a/20=15/75

a/20=1/5

a=20/5

a=4

b) 7/11=a/77

7×77/11=a

7×7/1=a

49=a

a=49

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Answer 2

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