Question

what a number added to 21 that number is 7.3 so what is number

Answer 1

so x +21 = 7.3
x=7.3-21
x= - 13.7

Answer 2

Here's your answer...

Let,

The unknown number be 'x'

Given,

x+21 = 7.3

x = 7.3-21

x = -13.7

-13.7 should be added to 21 to get 7.3

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HOPE THIS HELPS YOU...