Question 976769
L = meters of linen
C = meters of cloth


L + C = 30
75L + 25C = 1750


Multiply the first equation by 75.


75L + 75C = 2250
75L + 25C = 1750


Subtract to get 50C = 500, so C = 10 and L = 20.


Mrs. Cruz bought 10 meters of cotton and 20 meters of linen.