3.mr. smith's class sold wrapping paper for $ 3.50 each and mr. davis ' class sold magazines for $2.75 each. together, the classes sold 72 items and earned $222 for their school a write and solve a system of equations that model the problemshow all your work b which class earned more money ? how much more money did that class earn?

Mr. Smith's class sold 32 items for $112 and Mr. Davis's class sold 40 items for $110

Mr. Smith's class earned $2 more.

Step-by-step explanation:

Let

x = number of items Mr. Smith's class sold

y = number of items Mr. Davis's class sold

1. Together, the classes sold 72 items, then

2. .Mr. Smith's class sold wrapping paper for $3.50 each, so x items cost $3.50x.

Mr. Davis ' class sold magazines for $2.75 each, so y items cost $2.75y.

Together, the classes earned $222, then

3. You get the system of two equations:

From the first equation,

substitute it into the second equation:

Mr. Smith's class sold 32 items for and Mr. Davis's class sold 40 items for

Mr. Smith's class earned more.

4/6 = 2/3

so it should take 3/3 hours per man. so 9 hours is the answer 3*3 =9

step-by-step explanation: