Martina and Linda had $$68$$ seashells.  After Martina gave $$8$$ seashells to Linda, they had an equal amount of seashells.  How many seashells did Martina have at first? ． 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability
$$ 68\div 2=34$$, $$34+8=42$$. 