Posted by Miley on .
Yuki made cookies on Monday. Some friends came over and ate half the cookies on Tuesday. On wednesday,Yuki ate three cookies, and on Thursday, she took two cookies to school. By Friday, Yuki had seven cookies left. How many did she bake on Monday?
Please i need help

Math7 
helper,
x = number of cookies
x  (1/2 x + 3 + 2) = 7
x  (1/2 x + 5) = 7
2/2 x  1/2 x  5 = 7
1/2 x  5 = 7
1/2 x = 12
multiply both side by 2
x = 24 
Math7 
Miley,
Thank you!
I did one exercise and could you please check it
The temperature at 2:00 P.M was 19C. By midnight, it was 3C
What is the difference in the temperatures?
_____________=________
I thing the answer is:
(+19)(+22)=3
Correct? 
Math7 
Miley,
Correct?

Math7 
Ms. Sue,
How can a difference between 19 and  3 be only 3 degrees?

Math7 
helper,
From 19C to 3C is 22 degrees difference

Math7 
Miley,
Thank you!!