Question 189111
Let x=Rolando's birthday
    3x+4=Christina's birthday
    3x+1=Monique's birthday

x+(3x+4)+(3x+1)=54
7x+5=54
7x+5-5=54-5
7x=49
x=7

Rolando's birthday is on the 7th, Christina's is on the 25th and Monique's is on the 22nd