Fatouma is lifting weights over a 10-week training period. Every week, she lifts 2 kg
more than she lifted the previous week.
During the tenth week, she lifts 120 kg.
What mass did she lift during the first week?

14

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

5: 20

step-by-step explanation:

i think the answer is b. i hope i !