Can be formulated as a series of simultaneous equations - I.e. let x = # 50ps and let y = # 10ps, then the solution satisfies the equations:

5x + y = 85 and;
x + y = 10

So, using substitustion,

5x + 25 - x = 85


4x = 60
x = 15
y = 10

The answer is B) :call_me_hand:t3:

I think the answer is (d). I agree with your method of using simultaneous equations to solve it but I came up with these two

50x + 10y = 850 (Based on x being the number of 50 p’s and y being the number of 10 p’s)
x + y = 25 (As we know in total there are 25 coins)

Solving these gives us: x=15 and y = 10

If the machine then returns 5 ten pence coins, this then leaves y=5 in the machine.

So our ratio of 50 pence coins to 10 pence coins in the machine at the end is 15:5, this simplifies to 3:1.

1 Like

I think MathsFan may be right

Perhaps we can achieve consensus? #Collaboration

Spot on - the answer is d) and I didn’t fully read the question!


@Reliot, @MathsFan and @DoinGr8 have all collaborated on this question and so shall all get merit