64*65 =4,160... :-)
Cross multiply
[A1]*3----- [A1]` ------ 6x-21y = 39
then [A1]`+[A2] ------ x-12y = 32 ----- [B2]
[B2]*2---- [B2]` ------ 2x-24y = 64
[B1]-[B2]` -------------- 17y= -51 ------- [C1]
Answer:
20, remainder of 34
Step-by-step explanation:
0 2 0
4 6 9 5 4
− 0
9 5
− 9 2
3 4
− 0
3 4