Verified Answer :

PhyCS

Since 75 minutes is 5 times of 15 minutes, she can finish in proportion 2*5 = 10 homework problems.

VenusRetrograde

Answer= 10 math problems

 2math problems      x math problems
______________=_______________
   15 minutes               75 minutes

cross multiply
15x=150
divide both sides by 15
x=10 math problems

Lena can finish 10 math problems in 75 minutes

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