what placeholder to use around @myVar?

I need to pass a variable to the query parameter of xp_sendmail. What place holders do I use
to put a variable inside of this text string?

EXEC

master.dbo.xp_sendmail
@recipients = 'email@emailaddress.com',
@Subject = 'The Subject',
@Message = 'The Message',
@query = 'exec sp_MyProc '+ @myVar+' ', -- this is passing @myVar as a literal
@no_header= 'false',
@width = 160,
@attach_results = 'false'

as always thank you all for your help!!

it's all good

I figured it out.

DECLARE @MYVar numeric(9)
SET @MYVar = 10

SELECT 'the number '+cast(@MYVar as varchar(10))+' is my variable'

Anyone have another way let me know.

it's all good