Question

(b) 640 - 80 x 4- 4 of 20+639-
6)​

Answer 1

Answer:

640 - 80 × 4 - 4 of 20 + 639 - 6

=>640 - 80 × 4 - 80 + 639 - 6

=>640 - 320 - 80 + 639 - 6

=>640 + 639 - 320 - 80 - 6

=> 1279 - 320 - 80 - 6

=>1279 - 406

=> 873

Hope this answer helps you out.