Question

A bag contains 120 marbles. Some are red and the rest are black. There are 19 red marbles for every black marble. How many red marbles are in the bag?

a
1,080
b
114
c
361
d
101

Answer 1

Well if every red marbles is 19, and the rest are black, we need to subtract 120-19. And that equals 101

Answer 2

• 1black marble=19redmarbles

Total in one pair of red and black=19+1=20marbles.

No of pairs:-

$\\ \sf\longmapsto \dfrac{120}{20}=6pairs$

• 6pairs means 6black marbles rest are red.

Red marbles:-

$\\ \sf\longmapsto 120-6=114$

Option B