PSLE A shop had a number of laptops for sale. After selling 99 of them in the morning and
111 of the remainder in the afternoon, it was left with
12 of the laptops. How many laptops were sold altogether?
Morning |
Remainder |
|
Afternoon |
Left |
99 |
1x1 |
10x1 |
1x10 |
1x10 |
9 u |
1 u |
10 u |
Fraction of the remainder left
= 1 -
111 =
1011 10x111x1 Remainder =
1x102x10 Total
1011 Remainder =
1020 Total
Number of laptops sold in the morning
= 10 u - 1 u
= 9 u
9 u = 99
1 u = 99 ÷ 9 = 11
Total number of laptops sold
= 10 u
= 10 x 11
= 110
Answer(s): 110