Marie has $830 in her bank account and withdraws $60 each month. denise has $970 in her bank account and withdraws $80 each month.
in how many months will marie and denise have equal amounts of money in their accounts?
a. 4
b. 5
c. 7
d. 9

830-60x=970-80x
-60x=140-80x
20x=140
2x=14
x=7

C, 7 months

It is b as the correct answer is 0.088, you are able to work these out on a calculator or without a calculator if you type in the exact sum that is given for harder questions like these!

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.