Gabby had four times the number of metallic bricks as Oscar. Gabby used all her bricks to build 10 identical ships. Oscar used all his bricks to build 4 identical ships. Gabby used 9 more bricks than Oscar for each ship. How many bricks did Oscar have?
| |
Gabby |
Oscar |
| Number |
10 |
4 |
| Value |
1 u + 9 |
1 u |
| Total value |
10 u + 90 |
4 u |
Number of metallic bricks that Oscar used for each ship = 1 u
Number of metallic bricks that Gabby used for each ship = 1 u + 9
Number of metallic bricks that Oscar had
= 4 x 1 u
= 4 u
Number of metallic bricks that Gabby had
= 10 x (1 u + 9)
= 10 u + 90
Gabby had four times the number of metallic bricks as Oscar.
4 x 4 u = 10 u + 90
16 u = 10 u + 90
16 u - 10 u = 90
6 u = 90
1 u = 90 ÷ 6 = 15
Number of bricks that Oscar had
= 4 u
= 4 x 15
= 60
Answer(s): 60
