A gardener is planting two type of trees.
*Type A is three feet tall and graws at a rate of 14 inches per year.
*Type B is five tall and grows at a rate of 9 inches per year.
How many year will it take for these trees to grow to the same height?

A gardener is planting two types of trees. One type is seven feet tall and grows at a rate of 8 inches per year. The other type is four feet tall and its rate of the growth is 50% greater than the rate of the other tree. In how many years will the two grow to the same height?

A population grows at the rate of 5% per year. How long does it take for the population to double.

A population grows at the rate of 2% per year. How long does it take for the population to double?

A popular grows at the rate of 10% of the population per year. How long does it take for the population to doble ?

A popular grows at the rate of 10% of the population per year. How long does it take for the population to doble ?

Lichen grow at a very slow rat (1 mm per year). In how many years a lichen matures

A population grows at the rate of 10% of the population per year. How logn does it take for the population to double?

A certain sum of money amounts to Rs. 2900 at 4 % per annum in 4 years. In how many years will it amount to rupees 5000 at the same rate?