PSLE A shop had a number of stereo systems for sale. After selling 180 of them in the morning and
15 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 |
180 |
1x1 |
4x1 |
4x4 |
1x4 |
15 u |
1 u |
4 u |
Fraction of the remainder left
= 1 -
15 =
45 4x15x1 Remainder =
1x45x4 Total
45 Remainder =
420 Total
Number of stereo systems sold in the morning
= 16 u - 1 u
= 15 u
15 u = 180
1 u = 180 ÷ 15 = 12
Total number of stereo systems sold
= 16 u
= 16 x 12
= 192
Answer(s): 192