Three bells ring at intervals of 20 minutes, 30 minutes and 45 minutes respectively. A
how much time will the bells ring altogether?
Three pieces of timber 42m, 49m and 63m long have to be divided into planks of the
"ength. What is the greatest possible length of each plank?
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Given : the lengths of three pieces of timber are 42 m,49 m and 63 m respectively. we have to divide the timber into equal length of planks.
greatest possible length of each plank =HCF(42,49,63)
The prime factorization of 42,49 and 63 are:
42=2×3×7
49=7×7
63=3×3×7
HCF (42,49,63)=7
the greatest possible length of each plank is 7 m.
again, the number of planks can be formed =22.
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