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Jean spent 3/7 of her money on 2 cupcakes and 8 sardine pies, and 3/4 of the remaining money on 3 pandan cakes. Each cupcake cost twice as much as a sardine pie. Each pandan cake cost \$4.50 more than a cupcake. How much did she spend altogether?

Aug 25, 2021

#1
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You don't have to ask for one person specifically. Other people can help too, unless this is a problem you specifically want him/her to answer because of something.

Aug 25, 2021
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U answered my question for nothing >:

Guest Aug 25, 2021
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Hey Guest!

Thank you for asking me specifically but as sparkling water said, you don't need to ask for a certain person.

I'm not quite sure how to approach this problem but this is my best attempt: so each cupcake costs twice as much as a sardine pie, therefore c=2s (c represents cupcake and s represents sardine pie) so the cost of 2 cupcakes and 8 sardine pies is the same as the cost of 12 sardine pies. She then spent 3/4 of her remaining money which is 3/4 of the 4/7 left. This amount is the same as 1/7 of the original amount. The question says that pandan cakes cost 4.50 more than cupcakes but gives no clue as to the other prices. This leaves me at a dead end. You could instead change to amount of sardine pies into cupcakes so the cost of 2 cupcakes and 8 sardine pies is the same as the cost of 6 cupcakes but this still doesn't help us.

Could someone else try this question? I am new to this website and I do not have a great knowledge of maths so someone else here might be able to help.

SCZ

Aug 25, 2021
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To determine the amount Jean spent all together, we have to determine the cost of each of cupcakes sardine pies and pandan cakes. For this let S be the total money Jean have with her and let x be  the price of a sardine pies and .

It is given that each cupcake cost twice as much as a sardine pie. Therefore cost of a cup cake will be

2x. And it is also given that each pandan cake cost \$4.50 more than a cupcake. Therefore the cost of a pandan cake will be 4.5+2x.

Now Jean spends 3/7th her money buying 2 cupcakes and 8 sardine pies. which can be represented as an equation as follows;

3S/7 = 2(2x) + 8x

= 4x + 8x

= 12x

∴ 3S/7 = 12x ⋯⋯⋯⋯⋯ (1)

Now the remaining amount left with her will be;

S - 3S/7 = 7S - 3S/7

= 4S/7

Now spends 3/4th of this remaining money on 3 pandan cakes which can be represented as an equation as follows;

3/4 ⋅ 4S/7 = 3(2x + 4.5)

3S/7 = 6x + 13.5 ⋯⋯⋯⋯⋯ (2)

Now right hand side of both equation (1) and (2) are the same. So equating the right hand side of the two equations and solving for x as follows;

12x=6x + 13.5

12x - 6x=13.5

6x=13.5

x=13⋅5/6

=2.25

Therefore the cost of a sardine pies is \$2.25
Therefore the cost of a cup cake is equal to;

2x=2⋅2.25

=\$4.5

And the cost of Pandan pie is equal to;
2x + 4.5=4.5 + 4.5

=\$9

Therefore the total amount spend in buying 2 cupcakes 8 sardine pies, and 3 Pandan cake is given by;

total amount = 2(2x) + 8x + 3(2x + 4.5)

= 2 ⋅ 4.5 + 8 ⋅ 2.25 + 3 ⋅ 9

= 54

Therefore the total amount she have spend is \$54.

Aug 26, 2021