Question

2 pencils and a ruler cost £1.21 4 pencils cost £1.12 Work out the cost of 1 ruler (in £). alworking​

Answer 1

Answer: £0.65

Explanation:

i found the cost of 1 pencil by dividing 1.12 by 4 which is 0.28. Since 2 pencils and a ruler costs £1.21 and 1 pencil cost £0.28 then 2 pencils costs £0.56. £1.21-£.056=£0.65, so 1 ruler costs £0.65

Answer 2

Answer: 1 ruler = £0.65

Explanation:

Let p be the number of pencils and r be the number of rulers.

Then we're told 2p + r = 1.21 and 4p = 1.12.

We have two unknown values p and r, and two equations, so we can solve for p and r.

4p = 1.12 -> divide both sides by 4 to get p = 0.28

Substitute p = 0.28 into the first equation: 2(0.28) + r = 1.21

This is equal to 0.56 + r = 1.21 -> subtract 0.56 from both sides to get

r = 0.65

So the cost of 1 ruler is £0.65