Question

Num cinema há 12 fileiras com 16 poltronas e 15 fileiras com 18 poltronas o número total de poltronas é?

Answer 1

12*16=192
16*15=270
soma dos dois é =462

Answer 2

$\large\boxed{\begin{array}{l}\sf fileiras~poltronas\\\sf 1\longrightarrow 16\\\sf 12\longrightarrow x\\\sf x=12\cdot16\\\sf x=192\, poltronas\end{array}}$

$\large\boxed{\begin{array}{l}\sf fileiras~poltronas\\\sf 1\longrightarrow18\\\sf 15\longrightarrow x\\\sf x=15\cdot18\\\sf x=270\, poltronas\end{array}}$

$\large\boxed{\begin{array}{l}\sf O\, n\acute{u}mero\, total\,de\, poltronas\,\acute{e}\\\sf x=192+270\\\sf x=462 \,poltronas\end{array}}$