Answer:
9 years.
Step-by-step explanation:
Make x the number of years passed.

12 + 4x = 39 + x
27 = 3x
x = 9
Make both the fractions have the same denominator. 2/3 is equivalent to 14/21.
1/7 is equal to 3/21
14/21-3/21 = 11/21
Three added to the product of four and twelve
or
The product of four and twelve added by three
Answer:
50
Step-by-step explanation:
4 books = 200
1 book = x
Now do cross multiplicaton and divide:
1 x 200 ÷ 4
200 ÷ 4
50
60° bc 25+35=60, 180-60=20, 180-20=60, 60+60+x=180; x=60