See sstrike's answer to Vk's Primary 5 Maths Fractions Singapore question

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$2.50 : $4 = 5 : 8
5×3+1×(5+8) = 28
$546÷28 = $19.50
5×3×19.50÷2.50 = 117 (Ans)

3 years ago

How to get 5:8 ?

Sstrike

3 years ago

2.5：4=5：8
（×2 at both sides）

Sstrike

3 years ago

It's been stated in the picture already

3 years ago

Oh. 2.50 also can be ratio

3 years ago

Thank thank . I got it. Thank you

3 years ago

Usually for ratio we leave it in whole numbers at your level.

So the 2.50 : 4 is changed to 5 : 8

Sstrike

3 years ago

Vk u r welcome