17,18. The ratio of grade 5 to grade 6 pupils is 5:6. The ratio of grade 6 to grade 7 pupils is 6:7. There are 55 pupils in grade 5, how many pupils are in grade 7?
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stressnaako01
There are 77 students in grade 7 (55 ÷ 5) x 7 11 x 7 77
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(55 ÷ 5) x 7
11 x 7
77