Dana bought some eggs to bake cakes for a party. If she used 9 eggs for each cake, she would be short of 20 more eggs to bake all cakes. If she used 13 eggs for each cake, she would be short of 80 more eggs.
- How many cakes did she bake?
- How many eggs did Dana buy?
(a)
Small difference
= 13 - 9
= 4
Big difference
= 80 - 20
= 60
Number of cakes that Dana bought
= 60 ÷ 4
= 15
(b)
Number of eggs that Dana bought
= 15 x 9 - 20
= 135 - 20
= 115
Answer(s): (a) 15; (b) 115