I.  $N{a}_2{B}_4{O}_7+H_{2}S{O}_4\left(con\right)+5H_{2}O\stackrel{ }{\to }aX+otherproducts$
II.  $N{a}_2{B}_4{O}_7+2HCl\left(con\right)+5H_{2}O\stackrel{ }{\to }bY+otherproducts$
[Given that: X and Y are boron containing products
    : a and b are number of moles of X and Y formed in the balanced reactions] 
Then (a+b) is