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Earlier discussion
2 older comments kept for context.
Timothy Godspower
If 2 biros and 3 pencil is #18
Note a pencil is #2.5
Therefore 3 pencil will be
3 × 2.5 = 7.5
Subtract the total amount of pencil from 18
18 - 7.5 = 10.5 as the amount for the 2 biros
Now how much is a biro
Remember
2biro = #10.5
1biro = #x
Cross multiply
x# = #5.25. That's it
Classic Timmy Josh
Well done