handaff Posts: 1, Reputation: 1 New Member #1 Sep 12, 2011, 05:52 AM
Maths important question
Mark's daily pocket money is 40 cents more than jee sian's. Each of them spends $1.40 a day and saves the rest. By the time Jee Sian has saved$50, Maek has saved $20 more than Jee sian. How much is Jee Sian's daily pocket money?  Unknown008 Posts: 8,076, Reputation: 723 Uber Member #2 Sep 12, 2011, 10:27 AM Assign variables to the pocket money of Mark and Jee Sian. For example, let m be the daily pocket money of mark, let j be the daily pocket money of Jee Sian. From the first line, m = j + 40 You have to give Jee Sian 40 more cents to get the same amount as Mark. Each day, Mark spends$1.40, this means, he saves m - 1.4
Each day, Jee Sian spends $1.40, this means he saves j - 1.4 After some days, d, Mark has got$50. The number of days multiplied by the daily savings give the total saved.
d * (m - 1,4) = 50

same for Jee Sian;
d * (j - 1.4) = 20

So that you get two equations which can be combined:

$d = \frac{50}{m-1.4}$

$d = \frac{20}{j-1.4}$

$\frac{50}{m-1.4} = \frac{20}{j-1.4}$

And with two equations and two variables, can you solve for m and j, the daily pocket money of Mark and Jee Sian? :)

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