Tony buys 4kg of potatoes at £1.60 per kilogram and 2kg of onions at £1.80 per kilogram.
she pays with a £20 note.
how much change should she receive?

£10

Step-by-step explanation:

4 × 1.60 = 6.40

2× 1.80 = 3.60

6.40 + 3.60 = 10.00

Tony buys 4kg of potatoes at £1.60 per kilogram and 2kg of onions at £1.80 per kilogram.

She pays with a £20 note.

How much change should she receive?

4kg of potatoes at £1.60 = 4 x 1.60 = 6.40

2kg of onions at £1.80 = 2 x 1.80 = 3.60

4kg of potatoes + 2kg of onions = 6.40 + 3.60 = 10

£20 - £10 = £10

How much change should she receive? £10

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0