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Answers
the diagram is a sheet of muscles below the lungs which helps in breathing in and breathing out the muscle attached to ribs contract due to which our chest cavity expands and we are able to breathe in air due to decrease in air pressure inside the chest cavity
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┴┬┴┬┴┬┴ \___\ ﹨____\⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━⬤•━━━━━━━━━━[tex] \sf \: \: \: x= \frac{(mx_2+nx_1)}{(m+n)} ,y= \frac{(my_2+ny_1)}{(m+n)} \\ \\ Given: d=3
We know:
an=a+(n−1)d
∴a20−a15=[a+19d]−[a+14d]
=5d
=5×3
=15
Hence, the answer is 15.