PSLE Eight children shared the cost of a gift equally. When calculating the amount for each share, one of the children made a mistake by dividing the cost of the gift by 7 instead of 8. Each child paid $1.20 more than his share. What should be the cost of the gift?
|
8 children |
7 children |
Number |
8 |
7 |
Value |
1 u |
1 u + 1.20 |
Total value |
8 u |
7 u + 8.40 |
Cost of the gift if shared by 8 children
= 8 x 1 u
= 8 u
Cost of the gift if shared by 7 children
= 7 x (1 u + 1.20)
= 7 u + 8.40
The total amount that the 8 children shared is the same as the total amount that the 7 children shared.
8 u = 7 u + 8.40
8 u - 7 u = 8.40
1 u = 8.40
Cost of the gift
= 8 u
= 8 x 8.40
= $67.20
Answer(s): $67.20