Question

The ratio of money in Brian's wallet to Colin's wallet one day was 7:2. Brian spent ?39 that day. Brian now had ?4 less than Colin. How much did Colin initially have?

Answer 1

£14

Explanation:

hegartymaths gave this answer.

Answer 2

$17.2

Explanation:

The ratio of money in Brian's wallet to Colin's wallet is;

`B:C=7:2`

`\implies (B)/(C)=(7)/(2)`

`\implies B=(7C)/(2)` .....(1)

If Brian spent $39, then he now

has: $(B-39)

This amount compared to Collin's money is

$(B-39)=C+4

B=C+4+39

B=C+43.....(2)

Put equation (1) in (2)

`(7C)/(2)=C+43`

`7C=2C+86`

`7C-2C=86`

`5C=86`

`C=17.2`

Collins initially had $17.2