In a car park, there are 38 lorries and motorbikes. If there are 122 wheels altogether, how many motorbikes are there?
Number of
lorries |
Wheels of
lorries |
Number of
motorbikes |
Wheels of
motorbikes |
Total
wheels |
| 38 |
38 x 4 = 152 |
0 |
0 |
152 |
| 37 |
37 x 4 = 148 |
1 |
1 x 2 = 2 |
150 |
| 23 |
23 x 4 = 92 |
15 |
15 x 2 = 30 |
122 |
Total number of wheels if all the vehicles are lorries
= 38 x 4
= 152
Big difference between the number of wheels between the lorries and the motorbikes
= 152 - 122
= 30
Small difference between the number of wheels between a lorry and a motorbike
= 4 - 2
= 2
Number of motorbikes
= 30 ÷ 2
= 15
Answer(s): 15
