This is the 5th grade problem. this is exactly what i have.
rosa and her friends used 1 2/3 quart of paint on monday and 1 3/4 quart of pain on tuesday. how much paint will rosa and her friends need on wednesday. if rosa if rosa and her friends have 3/4 quart of pain left, do they
have enough pain to finish the job on wednesday?
there is no more information.
my answer : on wed they need 1 4/5(because mon-1 2/3, tue 1 3/4). 3/4 is not enough.(3/4 less then 1 4/5)is it correct?

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec