There are three plain counters for every two striped counters. After seven plain counters are removed, the numbers are equal. How many striped counters are there?
7
14
21
35
Need a hint?
How many extra plain counters are there in each group of three plain and two striped counters?
Show answer and worked explanation
B is correct. B — 14. Each group has one more plain counter than striped counter. Removing seven plain counters removes that difference, so there were seven groups. Each group has two striped counters: 7 × 2 = 14. Check: 21 plain − 7 = 14 striped.
