Answer:
2
Explanation:
Let the missing length be " x ".
( 3 + 1 ) / 6 = x / 3
4 / 6 = x / 3
Cross multiply,
x * 6 = 4 * 3
6 = 2 * 3
4 = 2 * 2
x * 2 * 3 = 2 * 2 * 3
Divide 2 * 3 on both sides,
x = 2
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