PSLE A shop had a number of stereo systems for sale. After selling 135 of them in the morning and
18 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 |
135 |
1x1 |
7x1 |
4x7 |
1x7 |
27 u |
1 u |
7 u |
Fraction of the remainder left
= 1 -
18 =
78 7x18x1 Remainder =
1x75x7 Total
78 Remainder =
735 Total
Number of stereo systems sold in the morning
= 28 u - 1 u
= 27 u
27 u = 135
1 u = 135 ÷ 27 = 5
Number of stereo systems sold in the afternoon
= 1 u
= 1 x 5
= 5
Answer(s): 5