PSLE A shop had a number of hi-fi systems for sale. After selling 91 of them in the morning and
712 of the remainder in the afternoon, it was left with
15 of the hi-fi systems. How many hi-fi systems were left?
Morning |
Remainder |
|
Afternoon |
Left |
91 |
7x1 |
5x1 |
4x5 |
1x5 |
13 u |
7 u |
5 u |
Fraction of the remainder left
= 1 -
712 =
512 5x112x1 Remainder =
1x55x5 Total
512 Remainder =
525 Total
Number of hi-fi systems sold in the morning
= 20 u - 7 u
= 13 u
13 u = 91
1 u = 91 ÷ 13 = 7
Number of hi-fi systems left
= 5 u
= 5 x 7
= 35
Answer(s): 35