LaibaAbdullah
Answered

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Barbara buys 3 boxes of eggs costing £1.20 each, 1 jar of mayonnaise costing £1.80 and 2 loves of bread. She pays with a £10 note and gets £1.60 change. Barbara works out the cost of 1 loaf of bread as £1.40. Is she correct?

Sagot :

Answer:

Barbara was not correct

Step-by-step explanation:

We can start by getting our variables straight so we can plug in values later.

x will be boxes of eggs

y will be the jar of mayonnaise

z will be the loaves of bread.

Then we can plug in our values

3x+y+2z=10-1.4

Plug in the euro values

3(1.2)+1.8+2z=10-1.4

Solve

3.6+1.8+2z=10-1.4

5.4+2z=8.6

Subtract 5.4 from both sides.

2x=3.2

Divide both sides by 2.

1.6

Now time to check my work.

3.6+1.8+2(1.6)=8.6

5.4+3.2=8.6

8.6=8.6

Barbara was wrong.

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