18,4, тоесть примерно 18 лет
1)8-3=5( кг )- одна коробка с бананами
2)5•9=45( кг )- 9 коробок с бананами
12,13,14,21,23,24,31,32,34,41,42,43
<span>340+? +120=<span> 460+ ?</span></span>
<span><span><span> ? -360 -120 =<span>? -460</span></span></span></span>
<span><span><span><span>360 -120 +? =<span> 240+?</span></span></span></span></span>
<span><span><span><span><span><span>360 -120 -? =<span>240 -?</span></span></span></span></span></span></span>
<span><span><span><span><span><span><span><span> 120 +360 -? =<span> 460-?</span></span></span></span></span></span></span></span></span>