Answer:
I had 16/5 instead of 5/16
Step-by-step explanation:
10 (a+b) = 42a
10a + 10b =42a
10b = a( 42 - 10)
(10)b = a(32)
32 /10 = a/b
16/5 = a /b
Ratio of a to b = 16 : 5
