Nancy has $700 and is spending $30 per week. Libby has $200 and is saving $20 per week. In how many weeks will Nancy and Libby have the same amount of money? 12

20

15

10

D 10

because 400=400

Step-by-step 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

the answer is 45 i just did it on oddesy ware