Answer:
D 10
because 400=400
Explanation:
N :700 - 30 (x)
L : 200 - 20 (x)
so the 1st week they'll both equal
N:670
L:220
we'll continue the subtraction process until they both hit and equal amount or hit zero
or the faster way, use the options of weeks were giving
lets try A
12th week
L: 12 x 30 = 360
700- 360 = 340
N: 12 x 20 = 240
200 + 240 = 440
340 < 440
we're a bit off from equal so next is B
N: 30 x 20 = 600
700 - 600 = 100
L: 20 x 20 = 400
200+ 400 = 600
100<600
this is incorrect as well which makes it incorrect which makes the user above incorrect
c.
N; 15 x 30 = 450
700 - 450 = 250
L: 15 x 20 = 300
200 + 300 = 500
250 < 500
Incorrect
the last option might be correct but lets check
30 x 10 = 300
700-300 = 400
10 x 20 = 200
200+200 = 400!
400=400 D is correct