## Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.

## Question

primary 6 | Maths
| Measurement

** One Answer Below **

Anyone can contribute an answer, even non-tutors.

**Answer This Question**

Please help?

After J spent 7/10 of her money, she has $120 less than R.

I see the numbers 5 and 10. We change 4:5 into 8:10 for easy computation.

At the start, R had 8 units and J had 10 units. After J spent 7 units (i.e. 7/10 of her money), she had 3 units of money left.

So in the end, R had 4 units and J has 3 units. Since J had $120 less than R at this point, the extra 1 unit represents $120.

Since R had 4 units at first, R must have had $480 at first.

Yes, you are right.

In view of this, the 5 units difference represents $120. After calculation, you should get 1 unit as $24 and 8 units as $192 so R had $192 at first.

We deal with the new ratios at this point as the ‘units’ are related to the new ratio, not old one.

### See 1 Answer

*done*{{ upvoteCount }} Upvotes

*clear*{{ downvoteCount * -1 }} Downvotes