PSLE A shop had a number of stereo systems for sale. After selling 28 of them in the morning and
13 of the remainder in the afternoon, it was left with
15 of the stereo systems. How many stereo systems were sold altogether?
Morning |
Remainder |
|
Afternoon |
Left |
28 |
1x1 |
2x1 |
4x2 |
1x2 |
7 u |
1 u |
2 u |
Fraction of the remainder left
= 1 -
13 =
23 2x13x1 Remainder =
1x25x2 Total
23 Remainder =
210 Total
Number of stereo systems sold in the morning
= 8 u - 1 u
= 7 u
7 u = 28
1 u = 28 ÷ 7 = 4
Total number of stereo systems sold
= 8 u
= 8 x 4
= 32
Answer(s): 32