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Question
primary 6 | Maths
| Ratio
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Date Posted: 5 years ago
Views: 362
Calvin started to save 1 week earlier than Dave. Means he saved for 7 days before Dave started.
$7 x 7 = $49
So when Dave started, he had $49 more than Dave.
From having $49 more to $59 less,
$49 + $59 = $108
So from the day Dave started, he had to save $108 more than Calvin in the same period, in order to have $59 more than Calvin overall.
Every day, Dave saves $3 more Calvin
$108 ÷ 3 = 36
So Dave has to save for 36 days.
Amount Calvin saved = 36 x $7 + $49
= $252 + $49
= $301
Check :
amount Dave saved in 36 days = 36 x $10 = $360
$360 - $301 = $59
$7 x 7 = $49
So when Dave started, he had $49 more than Dave.
From having $49 more to $59 less,
$49 + $59 = $108
So from the day Dave started, he had to save $108 more than Calvin in the same period, in order to have $59 more than Calvin overall.
Every day, Dave saves $3 more Calvin
$108 ÷ 3 = 36
So Dave has to save for 36 days.
Amount Calvin saved = 36 x $7 + $49
= $252 + $49
= $301
Check :
amount Dave saved in 36 days = 36 x $10 = $360
$360 - $301 = $59
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Date Posted:
5 years ago
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