Answer:
3
Step-by-step explanation:
B
I added all of then and then subtracted 47 from the 50.
-16800x^2y^2
let, x be the no of coins then according to question.Mary have 3x no of coins and John have x no of coins..
now, 3x+x=180
or,4x=180
or,x=180/4
therefore, x= 45
thus mary has 3×45=135 no of coins...