In a survey of a market ,143 people use white tooth paste and 135 use red tooth paste if 70 people use both tooth paste find the number of people who use at least one type of tooth paste
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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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