Jill, Apple and Peter each planted a tree 90 cm in height. In the time it took Jill's tree to grow 1 cm, Apple's tree grew 2 cm. In the time it took Apple's tree to grow 1 cm, Peter's tree grew 3 cm. The question is: How tall was Jill's tree when Peter's tree was 108 cm in height? There is four possible answers: 18cm, 36cm, 93cm or 96cm.
Please help with your explanation, thanks.
ual_1
Please help with your explanation, thanks.
ual_1