Solution:
[tex]\text{percent by mass} = \frac{\text{mass}_{sugar}}{\text{mass}_{kalamay}} × 100[/tex]
[tex]\text{mass}_{sugar} = \frac{\text{percent by mass}}{100} × \text{mass}_{kalamay}[/tex]
[tex]\text{mass}_{sugar} = \frac{40}{100} × \text{250 g}[/tex]
[tex]\boxed{\text{mass}_{sugar} = \text{100 g}}[/tex]
#CarryOnLearning
