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Let x be number of giftcard of 25$
y be number of giftcard of 50$
x+y=54
x=54-y. equation 1
25*x+50*y=2250
25(54-y)+50y=2250
1350-25y+50y=2250
25y=2250-1350
25y=900
y=36
put value of y in equation 1
x=54-36
x=18