Question

siti weighs 8 kg lighter than ravi.their total mass is 70 kg.what is ravi's mass

Answer 1

Given - Siti weighs 8 kg lighter than ravi. Their total mass is 70 kg.

Find - Ravi's mass

Solution - Let the mass of Siti be x and mass of Ravi be y.

Now, as per question, x = y - 8 -> Equation 1

Further expressing the relation between two ages in mathematical form-

x + y = 70 -> Equation 2

Keeping the value of x from Equation 1 in Equation 2.

y - 8 + y = 70

2y = 70 + 8

2y = 78

y = 78/2

y = 39

So, Ravi's mass is 39 kilograms

Siti's mass = y - 8

Siti's mass = 39 - 8

Siti's mass = 31

Thus, Ravi's mass is 39 kg and Siti's mass is 31 kilograms.