Shiyun bought 31 mangoes and 19 lemons on Tuesday. Each day, she ate 5 mangoes and 1 lemon. She started eating her fruits on Wednesday.

1. At the end of which day would there be an equal number of mangoes and lemons left? Give your answer in the following format. (Eg Monday)
2. How many more lemons than mangoes were there on Saturday?

	Mangoes	Lemons
Before	31	19
Change	- 5 u	- 1 u
After	31 - 5 u	19 - 1 u

(a)
Let the number of days be 1 u.

The number of lemons and mangoes in the end is equal.

31 - 5 u = 19 - 1 u
5 u - 1 u = 31 - 19
4 u = 12

1 u = 12 ÷ 4 = 3

Shiyun ate for 3 days from Wednesday onwards.  At the end of Friday, there would be an equal number of mangoes and lemons left.

(b)
Number of days from Wednesday to Saturday = 4

Number of mangoes left on Saturday
= 31 - (5 x 4)
= 31 - 20
= 11

Number of lemons left on Saturday
= 19 - (1 x 4)
= 19 - 4
= 15

Number of lemons more than mangoes
= 15 - 11
= 4

Answer(s): (a) Friday; (b) 4