Please answer this correctly

10 m by 5 m.

Step-by-step explanation:

The perimeter of the rectangle is 2*7 + 2*8 = 30 m

Let the length of the grey rectangle be x and the width y then:

2x + 2y = 30

Also we are given:

xy = 50  so:

x = 50 /y

Substituting in the first equation:

2y + 2 * (50/y) = 30

2y + 100/y = 30      Multiplying through by y:

2y^2 + 100 = 30y

2y^2 - 30y + 100 = 0

y^2 - 15y + 50 = 0

(y - 5)(y - 10) = 0

y = 5, 10

Therefore x = 50 / y = 10, 5

We took x as the length so x = 10 and y = 5.

the answer is n

chad should not have included the values (1, 2) and (3, 6) because that would mean he only had half a healing card.