Missing denominator

3 1/3 + 4/? =4 2/15
What is the missing number in the equation?

Correct answer:

x =  5

Step-by-step explanation:

a=331​=3+31​=33⋅ 3+1​=39+1​=310​=331​≐3.3333 b=4152​=4+152​=154⋅ 15+2​=1560+2​=1562​=4152​≐4.1333  a + 4/x = b   a⋅ x + 4 = b⋅ x  x ( a−b) = −4 x=b−a4​=1562​−310​4​=5

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