Three electrical appliances each have power ratings of
1
7
8
watts, and 2 other appliances each have power ratings of
4
3
4
watts.
what is the total power used by these appliances?
5 5/8 watts6 5/8 watts10 1/4 watts15 1/8 watts

15 1/8 watts

WORKINGS

Given,
Power ratings of three electrical appliances = 1 7/8 watts
Power ratings of two other electrical appliances = 4 3/4 watts
Total power used by these appliances is unknown

Total power used = power rating X number of appliances

Total power used by the first 3 appliances is 1 7/8 watts X 3= 15/8 watts X 3
= 45/8 watts

Total power used by the other 2 appliances is 4 3/4 watts X 2
= 19/4 watts X 2
= 19/2 watts

Total power used by all the 5 appliances = 45/8 watts + 19/2 watts
= 45/8 watts + 76/8 watts
= 121/8 watts
= 15 1/8 watts

Therefore, the total power used by all these appliances is 15 1/8 watts