PSLE Three pupils shared the cost of a gift equally. When calculating the amount for each share, one of the pupils made a mistake by dividing the cost of the gift by 4 instead of 3. Each pupil paid $1.80 less than his share. What should be the cost of the gift?
|
4 pupils |
3 pupils |
Number |
4 |
3 |
Value |
1 u |
1 u + 1.80 |
Total value |
4 u |
3 u + 5.40 |
Cost of the gift if shared by 4 pupils
= 4 x 1 u
= 4 u
Cost of the gift if shared by 3 pupils
= 3 x (1 u + 1.80)
= 3 u + 5.40
The total amount that the 4 pupils shared is the same as the total amount that the 3 pupils shared.
4 u = 3 u + 5.40
4 u - 3 u = 5.40
1 u = 5.40
Cost of the gift
= 4 u
= 4 x 5.40
= $21.60
Answer(s): $21.60