the question says we should find how many inches is 2540 centimers equal to
first, lets know how many centimeters makes 1 inch
so,
2.54cm ............................. 1 inch
2540cm ............................. x inch
lets cross multiply
2.54 X x = 2540 X 1
2.54x = 2540
divide both sides by 2.54
2.54x/2.54 = 2540/2.54
x = 2540/2.54
x = 1000
therefore,
2,540 centimeters is equal to 1000 inches