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# Major Axis of an Ellipse

SATSTM-V57DMX

What is the length of the major axis of the ellipse whose equation is $20{x}^{2}+40{y}^{2}=200$ ?

A

$10$

B

$20$

C

$\sqrt{10}$

D

$2\sqrt{5}$

E

$2\sqrt{10}$