Number of items sold by five persons A–E, Monday–Friday. Dashes are missing and to be calculated.
| Day | A | B | C | D | E |
|---|---|---|---|---|---|
| Monday | 840 | 880 | 480 | 560 | — |
| Tuesday | 720 | — | 1040 | 420 | 820 |
| Wednesday | 560 | 480 | 820 | — | 850 |
| Thursday | 1080 | 1020 | — | 1260 | 320 |
| Friday | — | 700 | — | 1020 | 800 |
If the ratio of the items sold by B and C together on Thursday to the items sold by C and E together on Thursday is 2:1, then the number of items sold by C on Thursday is:
A300
B420
C380 ✓ Correct
D340
Correct answer: (C) 380
Explanation
The number is 380, so that is the answer.
Let C on Thursday be x.
B on Thursday is 1020 and E on Thursday is 320.
So (1020 plus x) over (x plus 320) equals 2 over 1.
This gives 2x plus 640 equals 1020 plus x.
Solving gives x equal to 380.
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