In a store, some water guns and toy planes were on sale.
14 of the items were water guns.
23 of the water guns and 156 toy planes were sold. There were
19 of the items left in the store. How many water guns and toy planes were there in the store at first?
| |
Water guns |
Toy planes |
Total |
Comparing water guns
and toy planes at first |
1x9 =
9 u |
3x9 =
27 u |
4x9 =
36 u |
| Before |
3x3 =
9 u |
|
9x4 =
36 u |
| Change |
- 2x3 =
- 6 u |
- 156
|
- 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 toy planes left
= 4 u - 3 u
= 1 u
Number of toy planes sold
= 27 u - 1 u
= 26 u
26 u = 156
1 u = 156 ÷ 26 = 6
Number of water guns and toy planes at first
= 36 u
= 36 x 6
= 216
Answer(s): 216
