PSLE A shop had a number of hi-fi systems for sale. After selling 91 of them in the morning and
37 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 |
91 |
3x1 |
4x1 |
4x4 |
1x4 |
13 u |
3 u |
4 u |
Fraction of the remainder left
= 1 -
37 =
47 4x17x1 Remainder =
1x45x4 Total
47 Remainder =
420 Total
Number of hi-fi systems sold in the morning
= 16 u - 3 u
= 13 u
13 u = 91
1 u = 91 ÷ 13 = 7
Number of hi-fi systems sold in the afternoon
= 3 u
= 3 x 7
= 21
Answer(s): 21