Sue wants to increase 160 by 4% She writes down

160* 1.4 = 224

Sue's method is wrong.

a) Instead of multiplying by 1.4 , write down what she should have multiplied by >

Bill wants to decrease 160 by 6%
b) Complete he statement below to show how bill can decrease 160 by 6%

160 * =

Answer for a) = 0.04
Answer for b) = (160*0.06= 9.6)
160-9.6= 150.4

Planet earth has a mass of 5.9726x10²⁴ kg.then: 5.9726x10²⁴ kg=100% of the total earth mass.if the water´s mass=5x10-4 % of the total mass, we can solve this problem by the rule of three.5.9726x10²⁴ %*10⁻⁴ %x=(5.9726x10²³ kg)(5*10⁻⁴  %) / 100 %=2.9863x10¹⁹ kganswer:   the mass of the planet´s water would be   2.9863 x 10¹⁹ kg.