Question

Suppose $2$ kg of sugar contains $9\times {10}^6$ crystals.
How many sugar crystals are there in $5$ kg of sugar?

• A. $22500000$
• B. $27600000$
• C. $21850000$
• D. $24500000$

Answer 1

The correct option is A $22500000$

Number of crystals in $2$ kg sugar $=9\times {10}^6$

Number of crystals in $1$ kg sugar $=\frac{9\times {10}^6}{2}=4.5\times {10}^6$

Number of crystals in $5$ kg sugar $=4.5\times {10}^6\times 5=22.5\times {10}^6=2.25\times {10}^7=22500000$