3,5 ton + 7 kuintal - 300 pon= kg

3,5 ton=3500 kg
7 kuintal=700 kg
300 pon =150 kg

=3500kg+700kg-150 kg
=4200-150 kg
=4050 kg

(^^)^_^(^^)^_^

3,5 ton + 7 kuintal - 300 pon
= (3,5×1.000 kg)+ (7×100 kg) + (300÷2 kg)
= 3.500 kg + 700 kg - 150 kg
= 4.050 kg