PSLE Three children shared the cost of a present equally. When calculating the amount for each share, one of the children made a mistake by dividing the cost of the present by 4 instead of 3. Each child paid $3.20 less than his share. What should be the cost of the present?
|
4 children |
3 children |
Number |
4 |
3 |
Value |
1 u |
1 u + 3.20 |
Total value |
4 u |
3 u + 9.60 |
Cost of the present if shared by 4 children
= 4 x 1 u
= 4 u
Cost of the present if shared by 3 children
= 3 x (1 u + 3.20)
= 3 u + 9.60
The total amount that the 4 children shared is the same as the total amount that the 3 children shared.
4 u = 3 u + 9.60
4 u - 3 u = 9.60
1 u = 9.60
Cost of the present
= 4 u
= 4 x 9.60
= $38.40
Answer(s): $38.40