PSLE A shop had a number of hi-fi systems for sale. After selling 70 of them in the morning and
13 of the remainder in the afternoon, it was left with
15 of the hi-fi systems. How many hi-fi systems were sold altogether?
Morning |
Remainder |
|
Afternoon |
Left |
70 |
1x1 |
2x1 |
4x2 |
1x2 |
7 u |
1 u |
2 u |
Fraction of the remainder left
= 1 -
13 =
23 2x13x1 Remainder =
1x25x2 Total
23 Remainder =
210 Total
Number of hi-fi systems sold in the morning
= 8 u - 1 u
= 7 u
7 u = 70
1 u = 70 ÷ 7 = 10
Total number of hi-fi systems sold
= 8 u
= 8 x 10
= 80
Answer(s): 80