Question

find find value of x in the following proportions
1. x : 3 : 21​

Answer 1

Answer:

x = 7

Explanation:

1:x::3:21

1×21=x*3

21=3x

x=21/3

x = 7

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Answer 2

Explanation:

1 : x : 3 : 21

= 3 × x = 21 × 1

= 3x = 21

= x = 21 /3

= x = 7