Check whether the following statements show direct
proportion. Write Dif it shows direct proportion and ND if not.
1. Three pieces of pencil cost Php 12 while fifteen pieces
of pencil cost Php 60
2. Two boiled corn for Php 25 while 6 boiled corn cost
Php 75
3. Five teachers for every 125 pupils. Four teachers for
every 100 pupils
4. A motorist travels 275 km in 5 hours and continue
travelling at 140 km for 2 hours
5. Two boys can paint 5 desks a day while 8 boys can
paint 6 desks a day​