idonthaveaname18 idonthaveaname18
  • 25-08-2019
  • Mathematics
contestada

The difference between Sally’s PE mark and Science mark is 12, and the sum of the marks is 154. If the PE mark is the higher mark, what did Sally get for each subject?

Respuesta :

jimrgrant1 jimrgrant1
  • 25-08-2019

Answer:

PE = 83 and Science = 71

Step-by-step explanation:

let P represent PE and S represent Science with P > S, then

P + S = 154 → (1)

P - S = 12 → (2)

Adding the 2 equations term by term eliminates S

2P = 166 ( divide both sides by 2 )

P = 83

Substitute P = 83 into (1)

83 + S = 154 ( subtract 83 from both sides )

S = 71

Hence PE mark = 83 and Science mark = 71

Answer Link

Otras preguntas

17The diagram below shows an ideal transformer which is supplied with analternating voitage of 240V and a current of 1A.If the secondary current is 5A, what is
refer to the experiment below:soil+baking soda+water → creates gas bubblesoil+vinegar → no gas bubbleThe only possible explaination is that the baking soda reac
( q/p ) + 3p^2 if q=3.5 and p=1
[9](b) A billiard ball B at rest is struck by an identical ball A moving with a speed of 10 m/s alongthe positive y-axis. After the collision, the two balls mov
Explain the decrease in demand of digital cameras using a chart
p(n,6)=3p(n,5) what is the value of n.​
economic factors in decision making fall under
A boy who exerts a 300-N force on the ice of a skating rink is pulled by his friend with a force of 75 N, causing the boy to accelerate across the ice. If drag
( q/p ) + 3p^2 if q=3.5 and p=1
Kelsey makes pendants that she would like to sell at an upcoming craft fair. She must pay $200 to rent a booth at the craft fair. The materials for each pendant