Question

in a survey of market is found that 143 people use white toothpaste and 135 youth with toothpaste if 70 of them use both the toothpaste then find the number of person who used at least one of the toothpastehow can we find ​

Answer 1

Given : 143 people use white toothpaste and 135 sue another  toothpaste . 70 of them use both the toothpaste

To Find : the number of person who used at least one of the toothpaste

Solution:

White tooth Paste  = 143

Another tooth paste = 135

Both tooth paste  = 70

Only White tooth paste  = 143 - 70  = 73

Only another tooth paste = 135 - 70 = 65

number of person who used at least one of the toothpaste

= only white + only another + both

= 73 + 65 + 70

= 208

Another way = White tooth paste + another tooth paste - Both tooth paste

= 143 + 135 - 70

= 208

208   number of person who used at least one of the toothpaste

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