Question

Thabi and Senzo are marking 180 scripts for grade 12.

Thabi took 3 minutes to finish 1 paper.

Senzo took 1,5 minutes to finish 1 paper.

How long will it take them to finish 180 scripts?

Answer 1

If Thabi and Senzo are working simultaneously then they took 3 minutes to finish $1 +2=3$ papers.

Proportion

It takes them $3$ minutes to complete 3 tests.

It takes them $x$ minutes to complete 180 tests.

Then It takes them $180$ minutes to complete 180 tests.