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primary 5 | Maths | Rate & Ratio
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primary 5 chevron_right Maths chevron_right Rate & Ratio chevron_right Singapore

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Date Posted: 2 years ago
Views: 423
sstrike
Sstrike
2 years ago
【average】

$65 - $20 = $45

45×(u+$5) = 65×u

u = 45×$5÷20 = $11.25

65u
= 65×$11.25
= $731.25 (Ans)

Check:
$731.25÷65 = $11.25
$11.25 + $5 = $16.25

$731.25 ÷ $16.25 = 45
65-45 = 20 ✓✓✓

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