Question

Evaluate : (2^-1 × 5 ^-1 ) ^-1 ÷ 4^-1

Answer 1

Answer:

40

Step-by-step explanation:

$(2^{-1} \times 5^{-1} )^{-1} \div 4^{-1}\\\\=( \frac12 \times \frac15)^{-1} \times 4^1 \, \, ( \because \frac{1}{x^{-a}}=x^a )\\\\=(\frac{1}{10})^{-1} \times 4\\\\=10\times 4\\\\=40$