Pheromones are substances that animals, including insects, utilise to communicate with one another. These chemical messages are sent by insects to find food, warn others of predators, and attract mates (mainly by male). Traps can be used to track certain agricultural pests by using particular pheromones.
A can complete a piece of work in 15 days. B is 30% more efficient than A. If they work together, how many days will it take to complete the work?
(14.66)2 + (343.84 ÷ 3.88 - 55.87) = ? + 91.23
24.99 × 32.05 + ? - 27.01 × 19.97 = 29.99 × 27.98
Solve the following expression and calculate the approximate value.
5.55% of 8120 – 66.66% of 540 = ? – 28% of 5500
(15.98% of 399.99) - 6.998 = √?
√323.89 × (3.20) ÷ 9.02 =?
A regular hexagon has a side length of 8 units. What is the area of the half of the hexagon?
(18.21)² - (12.9)² = 20% of 649.9 - ? + 400.033
