IQ test

Here, $A=57$ and $B=19$

$A+B=57+19=76$

$A-B=57-19=38$

so, $A \div B =57 \div 19=\boxed3$

A + B = 76

A - B = 38

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2A = 114

A = 57 and B = A - 38 = 19

$\frac{A}{B}$ = $\frac{57}{19}$ = 3