E-867=108. how do i find the answer whether to subtract or to add

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

Acompany manufactures large valves, packed in boxes. a shipment consists of 1500 valves packed in 75 boxes. each box has the outer dimensions 1.2 x 0.8 x 1.6 m and the inner dimensions 1.19 x 0.79 x 1.59 m. the boxes are loaded on a vehicle (truck + trailer). the available capacity in the vehicle combination is 140 m3. each valve has a volume of 0.06 m3. - calculate the load factor on the box level (%). - calculate the load factor on the vehicle level (%). - calculate the overall load factor (%).

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?