Answer:
 answer is 75% blue-flower and 25% white- flower pea plants
Explanation:
  As Blue is dominant trait,
both parents are heterozygous dominant Â
Bb (father ) Â bb( mother )
So crossing between
   Bb     x   bb
                       B            b
                B      BB         Bb
                 b      Bb          bb
Offspring will be BB, Bb, Bb, bb
so 75% blue-flower and 25% white- flower pea plants