There are 32 pupils in Mr Patel’s class. There are 18 girls and 14 boys. All the pupils took a Maths test. The mean score for the girls was 79%. The mean score for the boys was 83%. Work out the mean score for the whole class.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

ok then what happened.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0