Question

In a science test devi scores 15 marks more than lixin . If devi obtains twice as many marks as lexin . Find the number of marks lixin obtains. ​

Answer 1

Lixin obtains 15 marks

Explanation:

Lets write two equations based on the question where: D= Devi and L=Lixin

D=L+15 - "devi scores 15 marks more than lixin"

D=2L - "devi obtains twice as many marks as lexin"

Now, substitute 2L as D in the first equation we wrote: (D=L+15)

2L=L+15

Next, subtract L from both sides:

L=15