Mrs. Hunt bought 6 spools of thread. Each spool of indigo thread is 10 metres long and each spool of red thread is 4 metres long. If Mrs. Hunt bought 30 metres of thread in total, how many rolls of each colour did she buy?

Mrs. hunt bought 1 indigo thread and 5 red thread

Step-by-step explanation:

Total spools of thread bought by Mrs hunt = 6spools

Indigo thread = 10m long

Red thread = 4m long

If Mrs. Hunt bought 30 metres of thread in total, this means she can only buy 1 indigo thread not 2 in order to be able to buy equal amount of red thread without any left over length.

Since 1 indigo thread = 10m,

remaining meter of thread left = 30m - 10m = 20m metres

This means she has 20metres of red thread to buy.

Since 1 red thread = 4m

x red thread = 20m

Cross multiplying;

x * 4 = 20

x = 20/4

x = 5

This means she can buy 5 red threads with the remaining metres of thread.

In total Mrs. hunt bought 1 indigo thread and 5 red thread