Information about a shipment of mirrors to a local store is shown. Of all of the medium mirrors that were shipped, how many of them were broken? 68 78 164 208

The answer:

according to the table of value of broken, not broken and total

we observe that

x + 96 = y

x is the number of medium broken, y is the total of medium

and we know that 102 + y + 214 = 480, therefore y = 480 - 102-214 = 164

so if y = 164, we can deduce that x + 96 = 164 implies x = 164 - 96 = 68

so the answer is 68

For those who cant see it. the answer:

according to the table of value of broken, not broken and total

we observe that

x + 96 = y

x is the number of medium broken, y is the total of medium

and we know that 102 + y + 214 = 480, therefore y = 480 - 102-214 = 164

so if y = 164, we can deduce that x + 96 = 164 implies x = 164 - 96 = 68

so the answer is 68