Question

Basaltic rocks contain approximately 45 to 52 percent silica. About how many kilograms of silica would you predict to be in a 92-kg boulder of basalt?

Answer 1

To find the answer, we can use the percentage above to find the amount of silica in 92kg of boulder of basalt.

If the Basalt is with 45 percent of silica:

92×45%
=41.4kg

If the Basalt is with 52 percent of silica:

92×52%
=47.84kg

We can then take the average to predict the amount of silica by using the lowest and highest approximation:

(41.4+47.84)÷2
=89.25÷2
=44.62kg

Therefore,the answer is 44.62kg.

Hope it helps!