How do you solve use multiplying by 1 to find an expression equivalent to 10 over 13 with the denominator of 78A?
10/13 = ?/78
78/?= 13 so ? = 6
10/13 x 6/6 = 60/78
You can also cross multiply 78x10/13=60, but if you have to use
multiplying by one, use the above method.