Fixed expenses are expenses that do not change from month to month. Yes these expenses are like monthly rent or EMI's, or monthly fee for your children etc.
Variable expenses are expenses that can fluctuate from month to month. Like sudden plan of parties or weddings, sudden illness of someone etc.
We have to convert the measurements the tray is 60 cm by 50 cm
if the cake tin is 25 cm in diameter, it will fit just 4 cakes because we have a length of 60 cm (will have 10 cm left over) and a width of 50 cm hope it helps