10kg 20kg 24kg ?kg plz answer this for me

27KG

Step-by-step explanation:

Mouse- M , Cat - C, Dog - D

M + C = 10 (1)

M + D = 20 (2)

C + D = 24 (3)

(1) - (2) => C - D = -10 (4)

(3) + (4) => 2C = 14

                => C = 7

Substitute C in (1)  => M + 7 = 10

                            => M = 3

Substitute M in (2) => 3 + D = 20

                            => D = 17

Therefore C + M + D = 7 + 3 + 17 = 27KG

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.