Posted by Anonymous on Sunday, September 18, 2011 at 2:23pm.
in a department store, there were a certain number of red tshirts, blue tshirts and yellow tshirts. 3/7 of the tshirts were red, 1/3 of them were blue, and the rest were yellow. If there were 20 more red tshirts than blue tshirts, how many yellow tshirts were there?

math  Henry, Tuesday, September 20, 2011 at 6:25am
X = the total # of tshirts.
3x/7 = the # of red tshirts.
x/3 = the # of blue tshirts.
(3x/720)=The # of blue tshirts,also.
x/3 = 3x/7  20,
x/3  3x/7 = 20,
Multiply both sides by 21:
7x  9x = 420,
2x = 420,
X = 210.
3x/7 = 3*210 / 7 = 90 Red tshirts.
x/3 = 210 / 3 = 70 Blue tshirts.
Y = 210  90  70 = 50 Yellow tshirts.
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