PSLE A shop had a number of stereo systems for sale. After selling 4 of them in the morning and
512 of the remainder in the afternoon, it was left with
12 of the stereo systems. How many stereo systems were left?
Morning |
Remainder |
|
Afternoon |
Left |
4 |
5x1 |
7x1 |
1x7 |
1x7 |
2 u |
5 u |
7 u |
Fraction of the remainder left
= 1 -
512 =
712 7x112x1 Remainder =
1x72x7 Total
712 Remainder =
714 Total
Number of stereo systems sold in the morning
= 7 u - 5 u
= 2 u
2 u = 4
1 u = 4 ÷ 2 = 2
Number of stereo systems left
= 7 u
= 7 x 2
= 14
Answer(s): 14