exam Maths Puzzle Numerical Ability

i am having trouble understanding these types of questions..can you help?

length of the major axis of the ellipse 3x^2+2y^2=6 is __________?

this is a problem we had in our class to be reviewed tomorrow..thanks.

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exam Other Question

On a standard die, the dots on the opposite faces have a sum of 7. How many different sums of dots on three adjacent faces are there on this standard die? Find three consecutive integers if twice the middle integer is equal to the sum of the first and the third.