PSLE A shop had a number of mobile phones for sale. After selling 18 of them in the morning and
512 of the remainder in the afternoon, it was left with
13 of the mobile phones. How many mobile phones were left?
Morning |
Remainder |
|
Afternoon |
Left |
18 |
5x1 |
7x1 |
2x7 |
1x7 |
9 u |
5 u |
7 u |
Fraction of the remainder left
= 1 -
512 =
712 7x112x1 Remainder =
1x73x7 Total
712 Remainder =
721 Total
Number of mobile phones sold in the morning
= 14 u - 5 u
= 9 u
9 u = 18
1 u = 18 ÷ 9 = 2
Number of mobile phones left
= 7 u
= 7 x 2
= 14
Answer(s): 14