102 kg of potatoes are sorted into 3 sizes: large, medium and small. The ratio by mass of the large to medium to small potatoes is 10 : 6 : 1. There are
25 as many large potatoes as medium potatoes. There are
12 as many small potatoes as large potatoes. There are 4 large potatoes per kilogram. Find the total number of small and medium potatoes.
Mass of potatoes |
Large |
Medium |
Small |
Total |
10 u |
6 u |
1 u |
102 kg |
Number of potatoes |
Large |
Medium |
Small |
2 |
5 |
|
2 |
|
1 |
2 p |
5 p |
1 p |
Total mass of potatoes
= 10 u + 6 u + 1 u
= 17 u
17 u = 102
1 u = 102 ÷ 17 = 6
Mass of large potatoes
= 10 u
= 10 x 6
= 60 kg
The number of large potatoes is repeated.
Total number of large potatoes
= 60 x 4
= 240
2 p = 240
1 p = 240 ÷ 2 = 120
Total number of small and medium potatoes
= 5 p + 1 p
= 6 p
= 6 x 120
= 720
Answer(s): 720