Finding a ratio after adding to one quantity Revision Card

Work with the original actual amounts.

Work with the original actual amounts.
Increase only the category named in the question. Leave the other amount unchanged.
Write the new ratio in the requested order and simplify.

Example 1

A bag contains 6 red counters and 9 blue counters. 1 red counter is added. Find the new ratio of red to blue.

Change the red amount.

Blue stays unchanged.

Write red : blue using the new amounts.

A bag contains 12 red counters and 16 blue counters. 2 red counters are added. Find the new ratio of red to blue.

Change the red amount.

Blue stays unchanged.

Write red : blue using the new amounts.

Remember
Use the worked steps to check your method, not just the final answer.

Question 1

A bag contains 20 red counters and 25 blue counters. 3 red counters are added. Find the new ratio of red to blue.

Check answer

Change the red amount.

Blue stays unchanged.

Write red : blue using the new amounts.

Question 2

A bag contains 30 red counters and 36 blue counters. 4 red counters are added. Find the new ratio of red to blue.

Check answer

Change the red amount.

Blue stays unchanged.

Write red : blue using the new amounts.

Question 3

A bag contains 42 red counters and 49 blue counters. 5 red counters are added. Find the new ratio of red to blue.

Check answer

Change the red amount.

Blue stays unchanged.

Write red : blue using the new amounts.

Question 4

A bag contains 21 red counters and 24 blue counters. 6 red counters are added. Find the new ratio of red to blue.

Check answer

Change the red amount.

Blue stays unchanged.

Write red : blue using the new amounts.

Question 5

A bag contains 32 red counters and 36 blue counters. 7 red counters are added. Find the new ratio of red to blue.

Check answer

Change the red amount.

Blue stays unchanged.

Write red : blue using the new amounts.