PSLE A shop had a number of mobile phones for sale. After selling 30 of them in the morning and
18 of the remainder in the afternoon, it was left with
12 of the mobile phones. How many mobile phones were left?
Morning |
Remainder |
|
Afternoon |
Left |
30 |
1x1 |
7x1 |
1x7 |
1x7 |
6 u |
1 u |
7 u |
Fraction of the remainder left
= 1 -
18 =
78 7x18x1 Remainder =
1x72x7 Total
78 Remainder =
714 Total
Number of mobile phones sold in the morning
= 7 u - 1 u
= 6 u
6 u = 30
1 u = 30 ÷ 6 = 5
Number of mobile phones left
= 7 u
= 7 x 5
= 35
Answer(s): 35