Using sine law we get --
=> sin A / 7 = sin B / 11
=> Sin B = (11/7) . sin A
=> sin B = ( 11 x sin A ) divided by 7 = 11 sin 20 / 7
=> sin B = 0.537460225
=> Angle ( B ) = sin⁻¹ (0.537460225) = 32.5 degree
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