You estimate the product by rounding to the nearest 10:
9 becomes 10 and 54 becomes 50
9 x 50 = 450
You would do
51-5= 46
then you would divide
46/2= 23
so Susan is
23+5=28
Susan is 28 years old and her sister is 23
28+23=51
It's b 240000
I'm sorry if wrong I'm not too good at these things
I believe it would be 20/15
21 and 1 because both numbers are odd
