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Math problem A school bought 140 black and white T-shirts. Wholesale price of black and white T-shirts 10 yuan. The wholesale price of white T-shirts in 25 yuan is 20.
Solution: Set X black shirts and 140-X white shirts.

Wholesale price of black T-shirts 10 yuan, retail price of 25 yuan; Wholesale price of white T-shirts 8 yuan retail price 20 yuan

Black earned 15 yuan, white earned 12 yuan.

15 * X+ 12 *( 140-X)= 1860

3X+ 1680= 1860

X=60

140-X=80

There are 60 black shirts and 80 white shirts.

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