Leah had 50 stickers. Leah gave 1/2 of the stickers to her sister. Of the amount left, she gave 2/5 to her friend. How many does Leah have left for herself?

Answer: Leah has 15 stickers left for herself.

Step-by-step explanation:

Total number of stickers that Leah had initially is 50. Leah gave 1/2 of the stickers to her sister. This means that the number of stickers that Leah gave to her sister is

1/2 * 50 = 25 stickers

Of the amount left, she gave 2/5 to her friend. This means that the number of stickers that Leah gave to her friend is

2/5 * 25 = 10 stickers

Therefore, the number of stickers that Leah have left for herself is

50 - (25 + 15)

= 50 - 35

= 15

15 stickers

1/2 of 50 = 25

2/5 of 25 = 10

25 - 10 = 15