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General: Use algebra to solve

Part a: Represent your unknowns (in this case, amount of money Mrs Tay have and cost of 1kg of sugar) as constants (in this case, x and y respectively)

Using these constants, come up with 2 equations and solve them simultaneously i.e getting rid of 1 constant through cancelling out gives you the value of the other constant (in this case, x cancels each other out as shown in the green box, allowing u to calculate what y is)

Part b: The link from a to b is subbing value of y back into the equations obtained in part a. U can either substitue back into eqn 1 or eqn 2 as both will give u the same answer. In this case, I chose eqn 1. After substituition, I will get value of x as shown

Part a: Represent your unknowns (in this case, amount of money Mrs Tay have and cost of 1kg of sugar) as constants (in this case, x and y respectively)

Using these constants, come up with 2 equations and solve them simultaneously i.e getting rid of 1 constant through cancelling out gives you the value of the other constant (in this case, x cancels each other out as shown in the green box, allowing u to calculate what y is)

Part b: The link from a to b is subbing value of y back into the equations obtained in part a. U can either substitue back into eqn 1 or eqn 2 as both will give u the same answer. In this case, I chose eqn 1. After substituition, I will get value of x as shown

Date Posted:
3 days ago

Sorry, I forgot to draw the green box. The cancelling out of x is in the eqn1 + eqn2 line

Thanks for the help but can you give me the solution but not in algebraic method .

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I used the model method this time round. Hope it helps!

Each box represents 1kg of sugar

The reason why part of the last block of the first row consists a 16 is coz Mrs Tay doesn't have enough money to buy all 6kg of sugar

Each box represents 1kg of sugar

The reason why part of the last block of the first row consists a 16 is coz Mrs Tay doesn't have enough money to buy all 6kg of sugar

Date Posted:
2 days ago