PSLE A shop had a number of mobile phones for sale. After selling 310 of them in the morning and
19 of the remainder in the afternoon, it was left with
15 of the mobile phones. How many mobile phones were sold altogether?
Morning |
Remainder |
|
Afternoon |
Left |
310 |
1x1 |
8x1 |
4x8 |
1x8 |
31 u |
1 u |
8 u |
Fraction of the remainder left
= 1 -
19 =
89 8x19x1 Remainder =
1x85x8 Total
89 Remainder =
840 Total
Number of mobile phones sold in the morning
= 32 u - 1 u
= 31 u
31 u = 310
1 u = 310 ÷ 31 = 10
Total number of mobile phones sold
= 32 u
= 32 x 10
= 320
Answer(s): 320