Betty bought some eggs to bake cakes for a party. If she used 10 eggs for each cake, she would be short of 15 more eggs to bake all cakes. If she used 13 eggs for each cake, she would be short of 69 more eggs.
- How many cakes did she bake?
- How many eggs did Betty buy?
(a)
Small difference
= 13 - 10
= 3
Big difference
= 69 - 15
= 54
Number of cakes that Betty bought
= 54 ÷ 3
= 18
(b)
Number of eggs that Betty bought
= 18 x 10 - 15
= 180 - 15
= 165
Answer(s): (a) 18; (b) 165