The answer is c because if you do 7x60 you'll get 420 and 830-420=410 and 7x80 you'll get 560 and 970-560 is also 410.
Answer:
The answer for this is a=1,b=7,c=19.
The present of 4 out of 30 is 13.33%
The present of 1 out of 30 is 3.33%
The present of 25 out of 30 is 83.33%
<u>Step-by-step explanation:</u>
- The percentage is calculated by dividing the required number with the full quantity and multiplied by 100.
First sum :

Second sum :

Third sum:

You change 1/3 and 3/4 so that they have the same denominator.
The GCF is 12 in this case.
1/3 x 4 = 4/12
3/4 x 3 = 9/12
4/12 + 9/12 = 13/12 or 1 1/12 (One and one twelfth)
Hope this helped !!