Question

The ratio of the ages of two boys is 3:4 after 3 yr the ratio will be 4:5 the ratio their ages after 21 yr will be

Answer 1

Answer: 11:12

Step-by-step explanation: The simplest ratio is 3:4. So there are two people with x and y ages respectively. a is the proportion rate. When a is 3, the ratio will expand to 9:12. After 3 years, the ratio will become 12:15, exactly 4:5 when made simplest form. After 21 years, the ratio will become 33:36, thus change to simplest form which is 11:12.