In a store, some water guns and frisbees were on sale.
14 of the items were water guns.
23 of the water guns and 78 frisbees were sold. There were
19 of the items left in the store. How many water guns and frisbees were there in the store at first?
| |
Water guns |
Frisbees |
Total |
Comparing water guns
and frisbees at first |
1x9 =
9 u |
3x9 =
27 u |
4x9 =
36 u |
| Before |
3x3 =
9 u |
|
9x4 =
36 u |
| Change |
- 2x3 =
- 6 u |
- 78
|
- 8x4 =
- 32 u |
| After |
1x3 =
3 u |
1 u |
1x4 =
4 u |
The total number of toys at first is repeated. Make the total number of toys at first the same. LCM of 4 and 9 is 36.
The number of water guns at first is repeated. Make the number of water guns the same. LCM of 9 and 3 is 9.
Number of frisbees left
= 4 u - 3 u
= 1 u
Number of frisbees sold
= 27 u - 1 u
= 26 u
26 u = 78
1 u = 78 ÷ 26 = 3
Number of water guns and frisbees at first
= 36 u
= 36 x 3
= 108
Answer(s): 108
