PSLE A shop had a number of hi-fi systems for sale. After selling 78 of them in the morning and
25 of the remainder in the afternoon, it was left with
16 of the hi-fi systems. How many hi-fi systems were sold altogether?
Morning |
Remainder |
|
Afternoon |
Left |
78 |
2x1 |
3x1 |
5x3 |
1x3 |
13 u |
2 u |
3 u |
Fraction of the remainder left
= 1 -
25 =
35 3x15x1 Remainder =
1x36x3 Total
35 Remainder =
318 Total
Number of hi-fi systems sold in the morning
= 15 u - 2 u
= 13 u
13 u = 78
1 u = 78 ÷ 13 = 6
Number of hi-fi systems sold in the afternoon
= 2 u
= 2 x 6
= 12
Answer(s): 12