PSLE A shop had a number of hard drives for sale. After selling 30 of them in the morning and
29 of the remainder in the afternoon, it was left with
12 of the hard drives. How many hard drives were sold altogether?
Morning |
Remainder |
|
Afternoon |
Left |
30 |
2x1 |
7x1 |
1x7 |
1x7 |
5 u |
2 u |
7 u |
Fraction of the remainder left
= 1 -
29 =
79 7x19x1 Remainder =
1x72x7 Total
79 Remainder =
714 Total
Number of hard drives sold in the morning
= 7 u - 2 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Number of hard drives sold in the afternoon
= 2 u
= 2 x 6
= 12
Answer(s): 12