WeekbeginDate grouping clause help needed

Transact-SQL
1

,
Hi,
Requirment:
Weekbegindate is Monday
weekenddate is Sunday
Weekbegindate should capture latest Numerator and Denominator within that week (Monday to Sunday)

I need help on calculating WeekBeginDate,ProjectID, sum(numerator) as Numerator ,Sum(Denominator) as Denominator based on below input dataset:

Date ProjectID Numerator Denominator
1/1/2018 12:00:00 AM P001 1 100
1/2/2018 12:00:00 AM P001 2 100
1/3/2018 12:00:00 AM P001 4 100
1/4/2018 12:00:00 AM P001 5 100
1/5/2018 12:00:00 AM P001 2 100
1/6/2018 12:00:00 AM P001 34 100
1/7/2018 12:00:00 AM P001 5 100
1/8/2018 12:00:00 AM P001 6 100
1/9/2018 12:00:00 AM P001 7 100
1/10/2018 12:00:00 AM P001 8 100
1/11/2018 12:00:00 AM P001 1 100
1/12/2018 12:00:00 AM P001 12 100
1/15/2018 12:00:00 AM P001 78 100
1/16/2018 12:00:00 AM P001 1 100
1/17/2018 12:00:00 AM P001 25 100
1/18/2018 12:00:00 AM P001 1 100

Final output should be:

WeekBeginDate ProjectID Numerator Denominator
1/1/2018 12:00:00 AM P001 5 100
1/8/2018 12:00:00 AM P001 12 100
1/15/2018 12:00:00 AM P001 1 100
2 
;WITH cte AS
(
	SELECT
		*,
		WeekBeginDate = DATEADD(dd, -DATEDIFF(dd,0,Date)%7, Date),
		N= ROW_NUMBER() OVER (PARTITION BY ProjectId, DATEADD(dd, -DATEDIFF(dd,0,Date)%7, Date)  ORDER BY Date DESC)
	FROM
		YourTable
)
SELECT 
	WeekBeginDate,
	ProjectId,
	Numerator,
	Denominator
FROM
	cte
WHERE
	N = 1;
3

Thanks James