Math
posted by Anonymous on .
one day a store sold 21 sweatshirts. White ones cost $10.95 and yellow ones costs $13.50. In all $275.85 worth of sweatshirts were sold. How many of each color were sold
How many white sweatshirts were sold?
How many yellow sweatshirts were sold?

two angles are supplementary. One angle is 3 degrees less that twice the other.Find the measures of the angles.
what is the measure of the smaller angle
what is the measure of the other angle 
X White shirts,
Y yellow shirts,
X + Y = 21 Shirts.
Y = 21  X
Cost = 10.95x + 13.5y = 275.85,
Substitute 21  X for Y
10.95x + 13.5(21  x) = 275.85,
10.95x + 283.5  13.5x = 275.85,
2.55x = 7.65
x = 3 = White shirts,
3 + Y = 21
y = 18 Yellow shirts.
x = 1st angle,
(2x  3) = 2nd angle,
x + (2x  3) = 180 Deg.
2x  3 = 180,
3x = 183,
x = 61 Deg. = Smaller angle,
(2x  3) = 2 * 61  3 = 119 Deg. =
Larger angle.